Compaq RAID Array 4100 User Manual
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RAID Array 4100
User Guide
Second Edition (January 2000)
Part Number 146297-002
Compaq Computer Corporation

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Summary of Contents for Compaq RAID Array 4100

  • Page 1 RAID Array 4100 User Guide Second Edition (January 2000) Part Number 146297-002 Compaq Computer Corporation...
  • Page 2: Compaq Storageworks Raid Array 4100 User Guide

    MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, GOOD TITLE AND AGAINST INFRINGEMENT. This publication contains information protected by copyright. No part of this publication may be photocopied or reproduced in any form without prior written consent from Compaq Computer Corporation. © 1999 Compaq Computer Corporation.
  • Page 3: Table Of Contents

    Rear Panel Features ....................1-5 Hot-Pluggability ...................... 1-5 Hot-Pluggable Drives ....................1-6 Maximum Storage ....................1-6 SCSI ID Assignments ....................1-6 Compaq StorageWorks RA4000 Controller ............1-6 Features......................1-7 Hard Drive Arrays .................... 1-7 Fault Tolerance ....................1-8 Capacity Expansion ..................1-8 Array Accelerator .....................
  • Page 4 Installing the Storage Hub..................2-13 Installing the Storage Hub 7 ................2-13 Installing the Storage Hub 12................2-14 Installing a Compaq Fibre Host Adapter in a Server ..........2-15 Fibre Channel Cables ..................... 2-15 Single-Mode Fibre Channel Cable..............2-15 GBIC Option Kit..................... 2-15 Multi-Mode Fibre Channel Cable ..............
  • Page 5: Troubleshooting

    About This Guide v Chapter 4 Troubleshooting Interpreting Component LEDs................. 4-1 Hard Drive LEDs....................4-1 Fibre Host Adapter LEDs ................. 4-2 RA4000 Controller LEDs ................. 4-3 Fibre Channel Storage Hub LEDs ..............4-5 Fan Assembly ....................4-7 Power Supply....................4-8 Replacing Components ....................
  • Page 6 Compaq StorageWorks RAID Array 4100 User Guide Running the Array Configuration Utility continued NetWare Online Array Configuration Utility (CPQONLIN)......... 5-27 Auto-configuration..................5-28 Custom Configuration..................5-29 Handling Disk Drive Failures ................. 5-33 Optimizing Array Controller Performance ............. 5-34 Chapter 6 Options ROMPaq Running the Procedure.....................
  • Page 7 About This Guide vii Appendix E Hard Drive Arrays The Drive Array....................... E-1 Drive Arrays ..................... E-4 Logical Drives ....................E-4 Drive Array Benefits....................E-5 Data Protection ....................E-5 Performance Enhancement ..................E-10 Distributing Data and Data Striping ............... E-10 Array Accelerator ...................
  • Page 8: About This Guide

    About This Guide This guide is designed to be used as step-by-step instructions for installation and as a reference for operation, troubleshooting, and future upgrades. It assumes you are qualified to install and service computer equipment and that you are trained to recognize hazards in products with hazardous energy levels, such as the power supplies in this computer system.
  • Page 9: Text Conventions

    Compaq StorageWorks RAID Array 4100 User Guide Text Conventions This document uses the following conventions to distinguish elements of text: Keys Keys appear in boldface. A plus sign (+) between two keys indicates that they should be pressed simultaneously.
  • Page 10: Symbols In Text

    About This Guide x Symbols in Text These symbols may be found in the text of this guide. They have the following meanings. WARNING: Text set off in this manner indicates that failure to follow directions in the warning could result in bodily harm or loss of life. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of information.
  • Page 11: Rack Stability

    Compaq StorageWorks RAID Array 4100 User Guide Any surface or area of the equipment marked with these symbols indicates the presence of a hot surface or hot component. If this surface is contacted, the potential for injury exists. WARNING: To reduce the risk of injury from a hot component, allow the surface to cool before touching.
  • Page 12: Compaq Technical Support

    Operating system type and revision level Detailed, specific questions Compaq Website The Compaq website has information on this product as well as the latest drivers and Flash ROM images. You can access the Compaq website at http://www.compaq.com. For continuous quality improvement, calls may be recorded or monitored.
  • Page 13: Compaq Authorized Reseller

    Compaq StorageWorks RAID Array 4100 User Guide Compaq Authorized Reseller For the name of your nearest Compaq Authorized Reseller: In the United States, call 1-800-345-1518. In Canada, call 1-800-263-5868. Elsewhere, see the Compaq website for locations and telephone numbers.
  • Page 14: Introduction

    Chapter Introduction The Compaq StorageWorks RAID Array 4100 is a high-performance, external system using various Fibre Channel devices and the Fibre Channel I/O Standard to connect servers to external storage systems. The Compaq StorageWorks RAID Array 4100 supports the following...
  • Page 15: Features

    1-2 Compaq StorageWorks RAID Array 4100 User Guide Wide-Ultra SCSI-3, Fast-Wide SCSI, and Fast SCSI-2 hard drive support The Compaq StorageWorks RA4100 comes in a rack-mountable model, as shown in Figure 1-1. Figure 1-1. Compaq StorageWorks RA4100 Features Table 1-1...
  • Page 16: Fan Assembly

    Introduction 1-3 Table 1-1 RA4100 Features continued Features Description SCSI ID Select Automatic Options Longwave GBIC Hot-Pluggable Components Drives Fan Assembly Redundant Power Supply LEDs Hard Drives Storage System Front Panel Fan Assembly RA4000 Controller Power Supply Warranty Three-years parts and labor On-site where available...
  • Page 17: Front Panel Features

    1-4 Compaq StorageWorks RAID Array 4100 User Guide Front Panel Features Figure 1-2 shows the front panel controls accessible to the user. Figure 1-2. Front panel Power switch Power LED Fault LED...
  • Page 18: Rear Panel Features

    Fan Assembly Hot-Pluggability Hot-pluggability refers to the ability to remove and replace components without powering down the system. There are four components in the Compaq RA4100 that are considered hot-pluggable: Hard Drives—Failed hot-pluggable drives in RAID 1, 4, and 5 configurations can be replaced without interrupting system operation.
  • Page 19: Hot-Pluggable Drives

    Compaq hot-pluggable drive trays. SCSI IDs are assigned automatically according to the drive location. Maximum Storage You may install a maximum of 12 drives in the Compaq RA4100. SCSI ID Assignments Each device on a SCSI bus must have a unique identification number in the range of 0 to 6.
  • Page 20: Features

    The advanced features supported by the RA4000 Controller are: Support for RAID 0, 1, 4, and 5 fault-tolerance options Fibre Channel support for connection to the server Support for Compaq Hot Plug Ultra2 Disk Drives at Wide-Ultra SCSI-3 speeds. Online Capacity Expansion (Microsoft Windows NT and Novell...
  • Page 21: Fault Tolerance

    1-8 Compaq StorageWorks RAID Array 4100 User Guide There are several ways to configure each set of hardware. The Array Configuration Utility helps you configure the hardware in the way that best suits your needs. See Chapter 5, “Running the Array Configuration Utility,”...
  • Page 22: Array Accelerator

    Introduction 1-9 Array Accelerator WARNING: There is risk of fire and burns if the battery pack is not handled properly. For precautions regarding batteries, see Appendix A, “Regulatory Compliance Notices.” The Array Accelerator consists of the 16-MB Read Cache on the controller board and 48-MB Read/Write ECC battery-backed removable cache.
  • Page 23: Performance Monitoring

    System Power System power in the Compaq RA4100 does not shut off completely with the power switch. The two positions of the front panel power switch should be considered as ON and STANDBY, rather than ON and OFF. The STANDBY position removes power from most of the electronics and the drives, but portions of the power supply and some internal circuitry remain active.
  • Page 24: Redundant Power Supply

    Introduction 1-11 Redundant Power Supply The Compaq RA4100 includes a second power supply, which acts as a redundant supply. The redundant power supply is identical to the primary supply and shares the electrical load equally. If either supply fails or is removed, the other supply takes over the full load without interruption.
  • Page 25: Installation

    Materials Needed IMPORTANT: To take advantage of all features and make sure you have the latest firmware update, check the Compaq website at www.compaq.com. To install the Compaq StorageWorks RAID Array 4100, you will need the following materials: Compaq RA4100...
  • Page 26: Installing The Raid Array 4100

    Pencil (not supplied) Cage nut installation tool (not supplied) Installing the RAID Array 4100 To install the Compaq StorageWorks RAID Array 4100, you will need to: 1. Choose a location. 2. Install the RA4100 in the rack. 3. Install the hot-pluggable drive(s).
  • Page 27: Choosing A Location

    IMPORTANT: For help in placing the storage system in the 19-inch rack, refer to the following documentation: Rack Resource CD Kit (shipped with Compaq racks or available through a Compaq authorized reseller) Rack Builder Configuration Tool CD (available on the Compaq website or can be...
  • Page 28: Installing The Ra4100

    If the system has multiple power supplies, disconnect power from the system by unplugging all power cords from the power supplies. CAUTION: The Compaq RA4100 must always be operated with the system unit cover on. Proper cooling will not be achieved if the system unit cover is...
  • Page 29: Environment

    Installation 2-5 Environment When installing your Compaq RA4100 in a rack, certain temperature standards and power requirements must be met. Space Requirements The following requirements must be considered when deciding where to install your rack: Clearance in the front of the rack should be a minimum of 25 inches for the front door to open all the way and for adequate airflow.
  • Page 30: Grounding

    Due to the higher ground leakage currents associated with the equipment, Compaq recommends the use of a Power Distribution Unit (PDU) that provides a supplementary ground conductor. This supplementary ground conductor should be permanently connected to a suitable building ground terminal.
  • Page 31: Airflow Requirements

    Airflow Requirements The Compaq RA4100 draws cool air in through the front door and exhausts warm air out through the rear of the server. Therefore, the front door of the rack must be adequately ventilated to allow ambient room air to enter the cabinet, and the rear door must be adequately ventilated to allow the warm air to escape from the cabinet.
  • Page 32: Blanking Panels

    2-8 Compaq StorageWorks RAID Array 4100 User Guide Blanking Panels If all the vertical space in the rack is not filled by components, the gaps that are left will cause a change in airflow through the rack and across the components.
  • Page 33 Installation 2-9 5. Use a pencil to outline the square holes in the front mounting rails indicated on the rack template tool that will be used to secure the mounting brackets and the storage system to the rack cabinet. 6. Use the reverse side of the rack template tool to mark the equivalent mounting holes on the rear mounting rails of the rack cabinet.
  • Page 34 2-10 Compaq StorageWorks RAID Array 4100 User Guide 10. Identify the front of the right and left mounting brackets. The tabs help align the bracket for correct mounting position. TROJ026.eps Figure 2-3. Mounting brackets with alignment tabs 11. Attach the brackets to the front mounting rails with the two screws provided.
  • Page 35 Installation 2-11 12. Attach the brackets to the rear mounting rails with the two screws provided. Tighten the screws securely. TROJ035.eps Figure 2-5. Attaching the brackets to the rear mounting rails 13. Place the RA4100 on the mounting brackets and slide it fully into the rack.
  • Page 36: Installing The Hot-Pluggable Hard Drives

    2-12 Compaq StorageWorks RAID Array 4100 User Guide Installing the Hot-Pluggable Hard Drives To install the hot-pluggable drives into the RA4100: 1. Choose the bay location (SCSI ID) of the drive. 2. Refer to the markings on storage system front panel to find the correct location of the drive tray.
  • Page 37: Installing The Storage Hub

    Installation 2-13 Installing the Storage Hub The StorageWorks RAID Array 4100 supports the Storage Hub 7 or the Storage Hub 12. Installing the Storage Hub 7 The Storage Hub 7 provides a central point of connectivity for the Fibre Channel Arbitrated Loop and should be mounted in a convenient location.
  • Page 38: Installing The Storage Hub 12

    2-14 Compaq StorageWorks RAID Array 4100 User Guide Installing the Storage Hub 12 The Storage Hub 12 provides a central point of connectivity for the Fibre Channel Arbitrated Loop and should be mounted in a convenient location. To install the Storage Hub 12: 1.
  • Page 39: Installing A Compaq Fibre Host Adapter In A Server

    1. Refer to the server documentation for specific instructions on how to install an EISA or a PCI option board in the server. 2. Refer to the Compaq StorageWorks Fibre Channel Host Bus Adapter Installation Guide for installation instructions specific to the Fibre Host Adapter.
  • Page 40: Multi-Mode Fibre Channel Cable

    Multi-mode Fibre Channel cables are capable of supporting distances of 2 meters to 500 meters. These cables are for use with Short-wave GBICs only. To ease the installation of the Compaq StorageWorks RAID Array 4100, three multi-mode Fibre Channel cable option kits are available from Compaq. Each kit contains a multi-mode Fibre Channel cable with a connector attached to each end.
  • Page 41: Cable Installation Considerations

    Installation 2-17 Cable Installation Considerations To ensure the cabling in the back of a rack system does not interfere with system operation or maintenance, follow these instructions for cable management. This configuration allows removal of either hot-pluggable power supply in redundant power supply systems without disturbing system operation.
  • Page 42: Connecting The Power

    2-18 Compaq StorageWorks RAID Array 4100 User Guide Connecting the Power If you were not provided with a power cord for your computer, you should purchase a power cord that is approved for use in your country. The power cord must be rated for the product and for the voltage and current marked on the product's electrical ratings label.
  • Page 43 2. Plug the power cord into a nearby, grounded outlet. 3. Plug the second AC power cord into the Redundant Power Supply. 4. Plug the second power cord into a nearby grounded outlet. This completes the hardware installation of the Compaq StorageWorks RAID Array 4100.
  • Page 44: Operation

    Storage Hub. Hard drives should be installed in the RA4100 so that they can be identified and configured at power The StorageWorks RAID Array 4100 components must be powered up in the following order: 1.
  • Page 45: Front Panel

    3-2 Compaq StorageWorks RAID Array 4100 User Guide Front Panel The front panel LEDs are found on the RA4100. Figure 3-1. Front panel LEDs Table 3-1 Front Panel LEDs Number Condition Meaning Power Green System power ON System in STANDBY or system power has been...
  • Page 46: Power Supply

    Operation 3-3 Power Supply The LEDs shown in Figure 3-2 apply only to the power supply on which they are located. Figure 3-2. Power supply LEDs Table 3-2 Power Supply LEDs Number Condition Meaning Status Amber Fault detected in this power supply. Amber flashing Failed self-test.
  • Page 47: Fan Assembly

    3-4 Compaq StorageWorks RAID Array 4100 User Guide Fan Assembly The fan assembly LED applies only to that module. Figure 3-3. Fan Assembly LED Table 3-3 Fan Assembly LED Condition Meaning Status Green Fans running normally. Amber Fault detected in one or more fans.
  • Page 48: Hard Drives

    Operation 3-5 Hard Drives The hard drive LEDs apply to the hard drive on which they are located. The three disk drive status LEDs (see Figure 3-4) define the operational status of each drive. Figure 3-4. Hard drive LEDs Table 3-4 Hard Drive LEDs Condition Meaning...
  • Page 49: Troubleshooting

    Compaq StorageWorks RAID Array 4100 operation. Interpreting Component LEDs If the fault LED on the front panel of the RA4100 is amber, or if Compaq Insight Manager indicates a fault, determine the reason for this alert immediately. Examine the component LEDs to see if any indicates a fault.
  • Page 50: Fibre Host Adapter Leds

    4-2 Compaq StorageWorks RAID Array 4100 User Guide Figure 4-1. Drive Failure LED If any Drive Failure LED appears amber, replace that drive as soon as possible. See “Replacing Components” later in this chapter for important information on when it is safe to replace drives.
  • Page 51: Ra4000 Controller Leds

    Troubleshooting 4-3 Figure 4-3. Fibre Host Adapter/E LEDs RA4000 Controller LEDs During normal runtime, the RA4000 Controller has 18 LEDs that indicate activity or malfunction of the controller. They are the Transmit LED , the Receive LED , and sixteen status LEDs labeled 0-15. Table 4-1 describes the purpose and function of each LED.
  • Page 52: Ra4000 Controller Led Descriptions

    4-4 Compaq StorageWorks RAID Array 4100 User Guide Table 4-1 RA4000 Controller LED Descriptions Function Description Busy status ON = All LEDs on indicate this array controller is idle OFF = All LEDs off indicate this array controller is operating at full capacity...
  • Page 53: Fibre Channel Storage Hub Leds

    Troubleshooting 4-5 Fibre Channel Storage Hub LEDs Storage Hub 7 The Fibre Channel Storage Hub 7 has two rows of LEDs. The top green LED is lit when a GBIC is installed correctly in the receptacle. Figure 4-5. GBIC-Installed LED on the Storage Hub 7 The bottom row of amber LEDs indicates when a specific port of the storage hub is in bypass mode.
  • Page 54 4-6 Compaq StorageWorks RAID Array 4100 User Guide Storage Hub 12 When power is applied, all LEDs turn on during the self-test, which lasts 15 to 60 seconds. After the power self test, the Power LED stays lit and the Fault turns off.
  • Page 55: Fan Assembly

    Troubleshooting 4-7 The lower amber LED is the Bypass Port LED, which indicates that the associated port is in bypass mode. Ports that do not detect valid FC-AL links are placed in bypass mode by the hub. The amber LED is turned on for each port in the bypass mode.
  • Page 56: Power Supply

    4-8 Compaq StorageWorks RAID Array 4100 User Guide Figure 4-10. Fan Assembly LED See “Replacing Components” later in this chapter for important information on how to replace this module. CAUTION: Do not allow the RA4100 to operate for more than five minutes without a working Fan Assembly in place.
  • Page 57: Replacing Components

    RA4100. If the procedure is done improperly, it is possible to lose data or damage equipment. IMPORTANT: To take advantage of all features, check the Compaq website (www.compaq.com) to make sure you have the latest firmware update.
  • Page 58 4-10 Compaq StorageWorks RAID Array 4100 User Guide 5. Squeeze the tabs on either side of the GBIC , then remove the GBIC by pulling it straight out of the RA4000 Controller Figure 4-12. Removing the Fibre Channel cable and GBIC 6.
  • Page 59: Replacing The Ra4000 Controller With Redundant Controller

    Troubleshooting 4-11 9. Push the controller in as far as it will go and close both latches against the rear panel . The levers on each latch should catch behind the metal lip, drawing the board into position and securing it into place. Figure 4-14.
  • Page 60 4-12 Compaq StorageWorks RAID Array 4100 User Guide Figure 4-15. Removing the Fibre Channel cable and GBIC 3. Squeeze the latches and pivot open the two ejector levers securing the RA4000 Controller.
  • Page 61 Troubleshooting 4-13 4. Remove the RA4000 Controller by pulling it straight out of the chassis Figure 4-16. Removing the RA4000 Controller 5. Install the replacement RA4000 Controller by inserting it into the tracks in the rear panel opening. 6. Push the controller in as far as it will go and close both latches against the rear panel .
  • Page 62: Replacing The Ra4000 Controller Cache

    4-14 Compaq StorageWorks RAID Array 4100 User Guide Replacing the RA4000 Controller Cache IMPORTANT: Replacing the RA4000 Controller cache with the same size cache does not require that you power down the system. If you upgrade the cache, or reinstall a different RA4000 Controller, you must power down the system.
  • Page 63 Troubleshooting 4-15 6. Carefully pull the daughterboard away from the controller board unplugging the signal connectors. Figure 4-19. Removing the daughterboard 7. Align the connectors of the new daughterboard with the controller board; plug the daughterboard onto the RA4000 Controller .
  • Page 64: Replacing Gbics

    4-16 Compaq StorageWorks RAID Array 4100 User Guide 9. With the daughterboard installed, push the RA4000 Controller in as far as it will go 10. Close both latches against the rear panel . The levers on each latch should catch behind the metal lip, drawing the board into place and securing it.
  • Page 65: Removing Fibre Channel Cables

    Troubleshooting 4-17 4. Pull the GBIC out of the device Figure 4-22. Removing the failed GBIC 5. To insert a new GBIC, reverse steps 1 through 4. CAUTION: To reduce the risk of damage to the equipment, do not use excessive force when inserting the GBIC module.
  • Page 66 To completely remove power from a system, unplug all power cords from the power supplies. IMPORTANT: To take advantage of all features, check the Compaq website (www.compaq.com) to make sure you have the latest firmware update. 1. Unplug the power cord from the failed power supply.
  • Page 67: Replacing The Fan Assembly

    Troubleshooting 4-19 CAUTION: Do not operate the RA4100 for extended periods of time with either power supply location open. Internal cooling airflow will be disrupted without a power supply or blank cover installed in both locations. This could cause overheating of internal components and possible data loss. Retain the blank power supply cover for reuse in case it is necessary to remove one of the supplies.
  • Page 68 4-20 Compaq StorageWorks RAID Array 4100 User Guide CAUTION: Do not allow the RA4100 to operate for more than five minutes without a working fan array module in place. Operation longer than this with no forced air cooling, especially in systems with a full complement of drives, may permanently damage the drives or electronics in the RA4100 and result in data loss.
  • Page 69: Replacing Hard Drives

    Troubleshooting 4-21 Figure 4-26. Installing the Fan Assembly Module The three fans should start turning immediately. The status LED on the Fan Assembly and the fault LED on the front panel will turn green after a few seconds, indicating a fully functioning fan assembly. Replacing Hard Drives CAUTION: If you must replace a hot-pluggable drive, it is important that you follow the guidelines in this section.
  • Page 70 4-22 Compaq StorageWorks RAID Array 4100 User Guide Drive Indicators OK to remove drive if not part of fault-tolerant configuration OK to remove failed drive DO NOT remove drive DO NOT remove drive DO NOT remove drive DO NOT remove drive...
  • Page 71 Troubleshooting 4-23 Follow these guidelines when replacing drives: Never remove more than one drive at a time. When you replace a drive, the controller uses data from the other drives in the array to reconstruct data on the replacement drive. If you remove more than one drive, a complete data set is not available to reconstruct data on the replacement drive(s) and permanent data loss could occur.
  • Page 72 4-24 Compaq StorageWorks RAID Array 4100 User Guide To replace a drive: Be sure that the Online and Drive Access LEDs are both OFF. See Figure 4-27. 1. Press the ejector and pivot the lever to full open position. Figure 4-28. Opening the drive tray latches 2.
  • Page 73 Troubleshooting 4-25 4. Insert the new drive into the same bay as the drive just removed, sliding it in as far as it will go . Make sure the ejector lever is in the full open position to ensure a correct latch. 5.
  • Page 74: Running The Array Configuration Utility

    The Array Configuration Utility is located on the SmartStart and Support Software CD. The utility uses a graphic interface to help you configure the Compaq StorageWorks RAID Array 4000 Controller. You can use the interface to configure the RA4000 controller initially, to add additional disk drives to an existing configuration, or to reconfigure an array controller.
  • Page 75: Before You Begin

    5-2 Compaq StorageWorks RAID Array 4100 User Guide Error and Warning Messages NetWare Online Array Configuration Utility The Array Configuration Utility: Uses easy-to-understand graphics to illustrate controller configuration Describes various configuration errors Uses wizards that guide you through the configuration process...
  • Page 76: Accessing Online

    The NetWare utility uses a menu- driven, non-graphic interface. To use the graphic interface, select one of the methods explained in the following sections to use the Compaq Array Configuration Utility offline. SmartStart and Support Software CD...
  • Page 77: Getting Help

    5-4 Compaq StorageWorks RAID Array 4100 User Guide Unused space on an array—If the Array Configuration Utility detects unused capacity in an array, the configuration wizard leads you through the process of configuring the space into one or more logical drives.
  • Page 78: Step 1: Choosing A Controller For The Array

    Running the Array Configuration Utility 5-5 Creating a New Array—Example For this example, use the following assumptions: Four 4.3-GB drives and two 9.1-GB drives are connected to the RA4000 controller. There will be two arrays. Array A consists of three 4.3-GB drives, with the fourth 4.3-GB drive used as a spare.
  • Page 79 5-6 Compaq StorageWorks RAID Array 4100 User Guide Figure 5-3. Controller Settings screen...
  • Page 80: Step 2: Grouping Physical Drives Of The Same Size Into An Array

    Compaq recommends that you limit the number of drives in an array to 14. 3. Select the drive at Port 1:SCSI ID 3 and click the Assign Spare to Array button update as advised.
  • Page 81 5-8 Compaq StorageWorks RAID Array 4100 User Guide Figure 5-5. Example Array A NOTE: The same spare drive can be assigned to multiple arrays. However, spare drives should have the same or greater capacity as the drives in the array.
  • Page 82: Step 3: Creating Logical Drives

    Running the Array Configuration Utility 5-9 Figure 5-6. Example Array - Logical Configuration View with one Array 5. Select the controller, then click the Create Array button to create Array B. 6. Assign both 9.1-GB drives to the array, then click the Done button. NOTE: In this example, each array was created using drives from the same SCSI Port.
  • Page 83 5-10 Compaq StorageWorks RAID Array 4100 User Guide Figure 5-7. Create Logical Drive screen 3. In the upper-left area of this screen, click the Distributed Data Guarding (RAID 5) option button. 4. Click the Array Accelerator Enable button. 5. Stripe Size can be left at the default for the selected RAID level, or set to another value.
  • Page 84: Capacity Expansion

    Running the Array Configuration Utility 5-11 Figure 5-8. Example array - Configuration View screen with two Arrays Capacity Expansion Capacity expansion involves adding storage capacity to an array that has already been configured. If an existing array is nearly full of data, you can expand the capacity without disturbing the existing data.
  • Page 85 5-12 Compaq StorageWorks RAID Array 4100 User Guide 2. Assign the new physical drives to an existing array. Existing logical drives will automatically expand across the physical drives, including the newly added ones. 3. Create a new logical drive to use the extra space on the expanded array.
  • Page 86 Running the Array Configuration Utility 5-13 Figure 5-10. Expansion wizards - Logical Drive screen 6. Click the Create Logical Drive button. 7. Set the fault tolerance, array accelerator, stripe size, and size for Logical Drive 2. 8. Click the Done button. 9.
  • Page 87: Capacity Extension

    5-14 Compaq StorageWorks RAID Array 4100 User Guide Capacity Extension Logical drive extension allows you to increase the size of existing logical drives without disturbing the data on those logical drives. If an existing logical drive is full of data, you can extend the logical drive when there is free space on the array.
  • Page 88 Running the Array Configuration Utility 5-15 NOTE: The Extend Logical Drive screen displays the current capacity and RAID overhead of the selected logical drive (Figure 5-11). Figure 5-11. Extend Logical Drive screen 4. Click the slider control to change (increase) the size of the logical drive. NOTE: You cannot reduce the size of the logical drive from this screen.
  • Page 89: Online Migration

    5-16 Compaq StorageWorks RAID Array 4100 User Guide Online Migration Use the Online RAID Level or Stripe Size Migration screen to: Reconfigure a currently configured logical drive to a new fault tolerance (RAID) level Change an existing logical drive’s stripe size to a new stripe size Both can be done online without causing any data loss.
  • Page 90 Running the Array Configuration Utility 5-17 Figure 5-12. RAID/Stripe Size screen 4. Click the (RAID 5) Distributed Data Guarding option button. 5. The stripe size can be left at the default for the selected RAID level or set to another value. In this example, 16 KB is selected. 6.
  • Page 91: Redundant Controllers

    5-18 Compaq StorageWorks RAID Array 4100 User Guide Redundant Controllers Redundant pairs of Raid Array 4000 Controllers are marked with a special icon and label in the Array Configuration Utility. Figure 5-13 shows a redundant pair of RA4000 Controllers in the Main Configuration Screen.
  • Page 92: Array Configuration Utility Screens

    Running the Array Configuration Utility 5-19 Array Configuration Utility Screens Main Configuration Screen The main configuration screen is the first screen that displays after the configuration wizard finishes. Some areas are highlighted and some appear gray. You cannot select gray areas until you select an item in the Configuration View box providing that option.
  • Page 93 5-20 Compaq StorageWorks RAID Array 4100 User Guide Help—Use to access online help. Controller Selection Box The Controller Selection box is located in the top left corner of the Main Configuration screen. Select this to see a list of the controllers installed in the system.
  • Page 94 Running the Array Configuration Utility 5-21 For each controller, the drive arrays, logical drives, and physical drives configured for that controller are listed. Use the Drive View option, located below the Configuration View box, to select the Physical or Logical view. Figure 5-16 shows the physical view of an RA4000 controller in slot 1.
  • Page 95 5-22 Compaq StorageWorks RAID Array 4100 User Guide Click the Settings button to display the Controller Settings screen (see the section titled “Controller Settings Screen” later in this chapter). Click the Create Array button to display the Create Array screen. (See the section titled “Create Array Screen”...
  • Page 96: Controller Settings Screen

    Running the Array Configuration Utility 5-23 Controller Settings Screen Use the Controller Settings screen to select the operating system and to set the Rebuild Priority, Expand Priority, and Accelerator Ratio. Rebuild and Expand Priority settings will not affect an idle system, but they will affect performance on a busy system.
  • Page 97: Create Array Screen

    5-24 Compaq StorageWorks RAID Array 4100 User Guide Create Array Screen In this screen, all available drives attached to the selected controller are displayed on the left. Drives assigned to the current array appear on the right. A port number and SCSI ID identify each physical drive.
  • Page 98: Create Logical Drive Screen

    NOTE: Given the reliability of a particular generation of hard drive technology, the probability of an array experiencing a drive failure increases with the number of drives in an array. Compaq recommends the number of drives in an array be limited to 14. Figure 5-23. Create Logical Drive screen The Logical Drive Size area includes a scale marked with the amount of drive capacity available for a logical drive.
  • Page 99 5-26 Compaq StorageWorks RAID Array 4100 User Guide This screen first displays the maximum size logical drive that can be created for your drive array. You can reduce this amount if you want to create more than one logical drive on the array. To reduce the size, type in the number or drag the pointer to the left.
  • Page 100: Error And Warning Messages

    Error and warning messages include instructions to correct configurations. If a warning message indicates “Internal Error Has Occurred” and cites an error code number, the problem requires assistance from Compaq technical support. See the “About This Guide” section at the beginning of this guide for technical support phone numbers.
  • Page 101: Auto-Configuration

    5-28 Compaq StorageWorks RAID Array 4100 User Guide Auto-configuration If no logical drives are configured, a CPQONLIN auto-configuration wizard (Figure 5-24) appears and prompts you to select fault-tolerance information. CPQONLIN then configures arrays optimally for the selected fault tolerance. Figure 5-24. Auto-configuration wizard with RAID 1 fault tolerance selected...
  • Page 102: Custom Configuration

    Running the Array Configuration Utility 5-29 Custom Configuration Custom configuration allows you to create arrays and assign fault tolerance one array at a time. To custom configure an array, make selections from the Main Configuration View screen. Highlight the controller, array, or logical drive to be configured.
  • Page 103 5-30 Compaq StorageWorks RAID Array 4100 User Guide Drive Rebuild, Expand Priority, and Accelerator Ratio To set the drive rebuild priority, expand priority, or accelerator ratio for a controller, highlight the controller at the Main Configuration View screen and select the Controller Settings option listed below Controller Options. The Controller Settings screen appears (Figure 5-26).
  • Page 104 Running the Array Configuration Utility 5-31 Accelerator Ratio The RA4000 controller has an onboard cache, called an Array Accelerator, which performs both write-posting and read-ahead caching. The setting in CPQONLIN determines the amount of memory allocated to the read and write caches.
  • Page 105 5-32 Compaq StorageWorks RAID Array 4100 User Guide Failed Drives or Interim Recovery Mode If a drive fails and hardware fault tolerance is enabled, operation continues. Replace the drive as soon as possible. Select a logical drive and press F3 to monitor the status of drive recovery (Figure 5-27).
  • Page 106: Handling Disk Drive Failures

    Running the Array Configuration Utility 5-33 If you do not replace the failed drive, the only option using the Array Configuration Utility is to delete logical drives. Do NOT delete logical drives that contain valid data. Doing so results in lost data. NOTE: A failed status can occur on drives protected by fault tolerance if two or more physical drives fail concurrently.
  • Page 107: Optimizing Array Controller Performance

    NetWare, the memory options default so that linear memory is used. To verify the setting, run the Compaq System Configuration Utility and view the Compaq Memory settings. Make sure that a linear option has been selected under the Base Memory option.
  • Page 108: Options Rompaq

    Use the Options ROMPaq utility to update the firmware on the RA4000 Controller and hard drives. NOTE: The RA4000 Controller firmware included in a new RA4100 may not be the latest version available. Check the Compaq website at www.compaq.com to determine whether you should update the firmware version. Running the Procedure To run Options ROMPaq: 1.
  • Page 109 6-2 Compaq StorageWorks RAID Array 4100 User Guide 7. Press Enter to go to step 9. 8. If the ROM firmware in the RA4000 Controller is older than that on the Options ROMPaq diskette, you will get the Select an Image screen:...
  • Page 110 Options ROMPaq 6-3 12. If you are finished reprogramming options, press Esc to exit the ROMPaq Utility. 13. Remove the Options ROMPaq diskette and reboot the server by cycling the power (cold boot). To upgrade additional options in the server, repeat steps 1 through 10 by booting from each Options ROMPaq diskette in succession.
  • Page 111: Regulatory Compliance Notices

    Numbers For the purpose of regulatory compliance certifications and identification, your StorageWorks RAID Array 4100 is assigned a Compaq Series number. The Compaq Series number for this product is: Series E01501. The Storage System Series number can be found on the product label, along with the required approval markings and information.
  • Page 112: Modifications

    A-2 Compaq StorageWorks RAID Array 4100 User Guide Modifications The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by Compaq Computer Corporation may void the user's authority to operate the equipment. Cables...
  • Page 113: Japanese Notice

    (GaALAs) emitting in the wavelength range of 770-860 nm, or indium gallium arsenide phosphide (InGaAsP) emitting in the wavelength range of 1270-1355 nm. All Compaq systems equipped with a laser device comply with safety standards, including International Electrotechnical Commission (IEC) 825. With specific regard to the laser, the equipment complies with laser product performance standards set by government agencies as a Class 1 laser product.
  • Page 114: Battery Replacement Notice

    Pentoxide, batteries. There is a danger of explosion and risk of personal injury if the array is incorrectly replaced or mistreated. Replace only with the Compaq spare designated for this product. For more information about battery replacement or proper disposal, contact your Compaq Authorized Reseller or your Authorized Service Provider.
  • Page 115: Electrostatic Discharge

    Appendix Electrostatic Discharge To prevent damage to the system, be aware of the precautions you need to follow when setting up the system or handling parts. A discharge of static electricity from a finger or other conductor may damage system boards or other static-sensitive devices.
  • Page 116: Grounding Methods

    B-2 Compaq StorageWorks RAID Array 4100 User Guide Grounding Methods There are several methods for grounding. Use one or more of the following methods when handling or installing electrostatic-sensitive parts: Use a wrist strap connected by a ground cord to a grounded workstation or computer chassis.
  • Page 117: Appendix C Specifications

    Appendix Specifications This appendix provides operating and physical specifications for the Compaq StorageWorks RAID Array 4100. Table C-1 RA4100 Specifications Parameter English Metric Dimensions Height 6.9 in 17.5 cm Depth 22.9 in 58.2 cm Width 19.0 in 48.3 cm Weight...
  • Page 118 C-2 Compaq StorageWorks RAID Array 4100 User Guide Table C-1 RA4100 Specifications continued Parameter English Metric Temperature Range Operating 50° to 95° F 10° to 35° C Shipping -22° to 122° F -30° to 50° C Relative Humidity (noncondensing) Operating...
  • Page 119: Fibre Channel Technology

    Appendix Fibre Channel Technology The information in this appendix defines Fibre Channel, describes its advantages, and outlines how it is used in the Compaq StorageWorks RAID Array 4100. Fibre Channel Standards Fibre Channel has an integrated set of standards developed by the American National Standards Institute (ANSI).
  • Page 120: Advantages Of Fibre Channel

    Fibre Channel and External Storage Systems Compaq supports two forms of Fibre Channel interconnect schemes with the Compaq StorageWorks RAID Array 4100. One connection method is point-to- point, where the server is directly connected to the external storage system by Fibre Channel cable.
  • Page 121: Point-To-Point Connection

    Fibre Channel Technology D-3 The arbitrated loop includes a device called the Compaq Fibre Channel Storage Hub, which provides bypass switching at each port of the device. This bypass feature ensures continuity of the loop should any connected port fail.
  • Page 122: Arbitrated Loop

    D-4 Compaq StorageWorks RAID Array 4100 User Guide 5-meter multi-mode Fibre Channel cable option kit, part number 234457-B22 15-meter multi-mode Fibre Channel cable option kit, part number 234457-B23 Single-mode for distances of more than 500 meters and up to 10 kilometers...
  • Page 123 Fibre Channel Storage Hub RA4100 2 RA4000 Controller 1 Storage Hub The following components are required for a typical FC-AL and Compaq StorageWorks RAID Array 4100 installation: Compaq Fibre Host Adapter/P or a Compaq Fibre Host Adapter/E installed in the server...
  • Page 124: Structured Format For Data Transmission

    D-6 Compaq StorageWorks RAID Array 4100 User Guide Compaq Fibre Channel Storage Hub One Compaq Fibre Channel cable Multi-mode for distances of 2 meters to 500 meters 2-meter multi-mode Fibre Channel cable option kit, part number 234457-B21 5-meter multi-mode Fibre Channel cable option kit, part number...
  • Page 125 The second level in the hierarchy is the sequence. The sequence is composed of one or more frames that contain data payload and are specific to a given protocol. SCSI protocol is sent on the Fibre Channel cable of the Compaq StorageWorks RAID Array 4100.
  • Page 126: Protocol Layers

    D-8 Compaq StorageWorks RAID Array 4100 User Guide Protocol Layers Five protocol layers are included in the Fibre Channel standard. They are FC-0 through FC-4. FC-0 defines the physical characteristics of the interface used. It also includes the cable type, connectors, drivers, (short-wave lasers, long-wave lasers) transmitters, and receivers.
  • Page 127: Hard Drive Arrays

    The information in this appendix describes hard drive array concepts, data protection methods, including fault-tolerance options, and data reliability features of the Compaq RA4000 Controller installed in the Compaq StorageWorks RAID Array 4100. Before configuring the RA4000 Controller, review the following general information so that you will be familiar with the terms and concepts required for configuration.
  • Page 128 E-2 Compaq StorageWorks RAID Array 4100 User Guide Physical Physical Physical Drive 1 Drive 2 Drive 3 Logical Drive 1 Logical Drive 2 Drive Array Daz-9-12.EPS Figure E-1. Drive array with two logical drives Physical Physical Physical Drive 1 Drive 2...
  • Page 129 Hard Drive Arrays E-3 Figure E-3 illustrates a larger array with two logical drives across six physical drives. Physical Drives Drive 1 Drive 2 Drive 3 Drive 4 Drive 5 Drive 6 Logical Drive 1 Logical Drive 2 Drive Array Daz-9-16.EPS Figure E-3.
  • Page 130: Drive Arrays

    E-4 Compaq StorageWorks RAID Array 4100 User Guide Drive Arrays Drive arrays have several important attributes: A single array cannot span more than one RA4000 Controller. A single RA4000 Controller can control multiple arrays. Arrays must have at least one and may have up to 12 physical drives.
  • Page 131: Drive Array Benefits

    Hard Drive Arrays E-5 Drive Array Benefits The benefits of using drive arrays include: Data protection Performance enhancement Capacity changes Data reliability Data Protection The RA4000 Controller provides several options to produce data redundancy for a more reliable system including distributing data, fault-tolerance methods, assigning online spares, and rebuilding data.
  • Page 132 E-6 Compaq StorageWorks RAID Array 4100 User Guide Table E-1 RAID Level Characteristics Distributed Data Mirroring No Fault Data Guarding (RAID 1) Tolerance Guarding (RAID 4) (RAID 0) (RAID 5) 67% to 93% 67% to 93% 100% Usable Disk Space*...
  • Page 133 Hard Drive Arrays E-7 no data protection and you will have to rely on backups in case of hardware failure. Distributed Data Guarding (RAID 5) Distributed data guarding, also called RAID 5, stores parity data across all the drives in the array. Spreading the parity across all the drives allows more simultaneous read operations and higher performance than data guarding (RAID 4).
  • Page 134 Figure E-6. Data guarding stores redundant data [P] on a separate drive The RA4000 Controller supports RAID 4 for backward compatibility. Because RAID 5 provides the same benefits with higher performance, Compaq recommends using RAID 5 instead of RAID 4.
  • Page 135 Hard Drive Arrays E-9 RAID 1 always requires an even number of drives. To improve performance in configurations with more than two drives, the data is striped across the drives. If a drive fails, the mirror drive provides a backup copy of the files and normal system operations are not interrupted.
  • Page 136: Performance Enhancement

    E-10 Compaq StorageWorks RAID Array 4100 User Guide Online Spare During configuration, consider assigning an online spare to further improve your system’s fault tolerance. An online spare (sometimes called a hot-spare) is a drive the controller uses when a drive failure occurs. If a drive fails, the controller rebuilds the data that was on the failed drive onto the online spare.
  • Page 137: Array Accelerator

    Hard Drive Arrays E-11 Table E-2 Data Striping Options Fault Tolerance Level Stripe Sizes (in sectors) RAID 0 16, 32, 64, 128, 256, 512 RAID 1 16, 32, 64, 128, 256, 512 RAID 4 16, 32, 64, 128 RAID 5 16, 32, 64, 128 For example, consider an operating system that typically requests data in 32-sector blocks.
  • Page 138 E-12 Compaq StorageWorks RAID Array 4100 User Guide Performance The array accelerator increases performance by having the array controller write data to the cache memory on the array accelerator rather than directly to the drives. The system can access this cache memory more than 100 times faster than accessing disk storage.
  • Page 139: Concurrent I/O Request Servicing

    Hard Drive Arrays E-13 The cells used in the array accelerator batteries are recharged via a “trickle” charge applied while system power is present. If posted writes were stored in the memory of the array accelerator and power loss occurs, power must be reinstated within approximately four days or the data stored in the memory will be lost.
  • Page 140: Expanding Storage Capacity

    E-14 Compaq StorageWorks RAID Array 4100 User Guide Expanding Storage Capacity The RA4000 Controller allows the configuration of one or more separate logical drives into a single drive array. Adding one or more logical drives to an existing drive array can expand an array. To create the room for the additional logical drives, more physical drives must be added.
  • Page 141 Daz-9-14.EPS Figure E-10. Expanded array storage capacity with a second logical drive For example: Assume you have two Compaq RA4100(s), with a total of 10 drives; you want to expand this to the 12-drive maximum supported by one RA4000 Controller. With Array Configuration Utility running, simply install four matching drives in the empty drive bays.
  • Page 142: Online Capacity Expansion

    E-16 Compaq StorageWorks RAID Array 4100 User Guide It is important to remember that all physical drives in an array should be the same size (capacity). This is because each drive contains an equal portion of one or more logical drives and the portion sizes can only total the size of the smallest drive.
  • Page 143: Other Fault Management Features

    Hard Drive Arrays E-17 Other Fault Management Features The RA4000 Controller and the network operating system offer several other fault management and data reliability features, including: Auto reliability monitoring Dynamic sector repairing Drive parameter tracking Drive failure alert features Interim data recovery Automatic data recovery Auto Reliability Monitoring Auto reliability monitoring (ARM) is a background process that scans hard...
  • Page 144: Drive Failure Alert Features

    Drive Failure Alert Features Drive failure features produce various drive alerts or error messages depending on the Compaq server model. Refer to the documentation included with your server to determine what drive failure features are included on your server model.
  • Page 145: Recovering From Hard Drive Failure

    Note that the amber LED may illuminate briefly when a hot- pluggable drive is inserted - this is normal. Amber LED illuminates on the front of the Compaq RA4100 Array if drives failed inside (other problems such as fan failure or over- temperature conditions also cause this LED to illuminate).
  • Page 146: Fault Tolerance And Drive Failure

    F-2 Compaq StorageWorks RAID Array 4100 User Guide Compaq Insight Manager can detect failed drives remotely across a network. Problems such as reduced system performance or disk errors reported by the operating system do not necessarily imply that a drive has or has not failed. If drive failures or repeated errors are suspected, Compaq recommends running the Array Diagnostic Utility on the system.
  • Page 147: Spare Drives

    Recovering From Hard Drive Failure F-3 In any RAID 1 logical drive on the RA4100 having N physical drives in the array (not including spare drives), the first N/2 physical drives are mirrored in consecutive order to the second N/2 physical drives. When determining the order, number each drive in the array by increasing IDs on the first SCSI bus, followed likewise by drives on the second SCSI bus.
  • Page 148: Automatic Data Recovery

    F-4 Compaq StorageWorks RAID Array 4100 User Guide CAUTION: If the RA4100 has failed a drive, replace the drive with a new or known-good replacement drive. In some cases, a drive that has previously failed by the controller may appear to be operational after the system is power-cycled, or after removal and reinsertion of a hot-pluggable drive.
  • Page 149: Compromised Fault Tolerance

    Recovering From Hard Drive Failure F-5 unrecoverable disk errors. In this case, the replacement drive should be removed and replaced with another replacement drive. Compromised Fault Tolerance If fault tolerance is compromised due to failure of multiple drives, the condition of the logical drive will be failed and unrecoverable errors will be returned to the host.
  • Page 150 Index array buttons Array Configuration Utility 5-22 accelerator ratio 5-23, 5-31 illustrated 5-22 ACU D-4, D-6, E-16, 1-7 Array Configuration Utility Capacity Expansion 1-8 accelerator ratio 5-23 configuring hardware 1-8 array buttons 5-22 disabling Array configuration wizards 5-3 Accelerator 1-9 controller buttons 5-21 running 2-3 controller selection box 5-20...
  • Page 151 2 Compaq StorageWorks RAID Array 4100 User Guide view screen with two arrays, illustrated 5-10 cables Array Diagnostic Utility F-2 bundling 2-17 Array Diagnostics Utility 1-7 channel 2-17 arrays See also hard drives, arrays connecting 2-3, 2-13, 2-14, adding capacity 1-8...
  • Page 152 5-14 creating a new array 5-4 third party partitioning custom, expand an array 5-31 tools 5-15 main screen, illustrated 5-19 changing RAID level software, See also Compaq example 5-16 Array Configuration changing stripe size Utility 5-1 example 5-16 wizard...
  • Page 153 4 Compaq StorageWorks RAID Array 4100 User Guide disk drive failures, distributing E-10, 1-7 handling 5-33 duplicate E-8 functions guarding E-5, E-7, E-8 accelerator ratio 5-31 integrity 1-9 drive rebuild 5-30 ensuring D-1 set priority 5-30 loss of E-9, F-1, F-5...
  • Page 154 Index 5 drive bays, IDs 1-6 error messages drive failure Array Configuration probability 5-7 Utility 5-27 drive mirroring 1-8. See also errors RAID 1 unrecoverable F-2, F-4, F-5 drive rebuild 5-30 expand priority 5-23 drive trays 2-12 extending capacity 5-14 drive view box, Array Configuration Utility 5-21 drivers...
  • Page 155 6 Compaq StorageWorks RAID Array 4100 User Guide Fibre channel Fibre host adapter advantages D-2 FC-AL D-4 arbitrated loop See FC-AL LEDs 4-2 interconnect schemes D-2 point-to-point D-3 standards D-1 Fibre host adapter technology D-1 connecting 2-3 Fibre Channel drivers supporting 2-3...
  • Page 156 Index 7 front panel LEDs 3-2 removing 4-10, 4-11 GBIC Installed LEDs on the replacing 4-11, 4-13 Storage Hub 12 4-6 Shortwave 1-1, 2-2, 2-16 GBIC Installed LEDs on the getting help xii Storage Hub 7 4-5 Gigabit Interface Converters See hard drive LEDs 3-5 GBICs inserting the drive 2-12, 4-24...
  • Page 157 8 Compaq StorageWorks RAID Array 4100 User Guide conditions 1-5 data striping distributes data effect on performance E-7, E-8 across all physical procedure 4-24 drives E-11 SCSI 1-10, 2-1 distributed data guarding securing 2-12, 4-25 distributes redundant spare F-3 data E-7...
  • Page 158 Index 9 power supply LEDs 3-3 green 4-19, 4-21 RA4000 Controller LEDs 4-3 hard drive F-1 removing the Fan Online 4-24 Assembly 4-20 flashing 4-25 removing the power power supply 4-18 off 4-8 removing the RA4000 Power 4-6 power supply 3-3, 4-8 Controller 4-10, 4-13 simple point-to point Fibre RA4100 3-1...
  • Page 159 10 Compaq StorageWorks RAID Array 4100 User Guide Array Configuration Utility 5-19 NetWare controller box, illustrated 5-21 add spare drives 5-31 controller buttons 5-21 auto-configuration wizard, controller selection box 5-20 illustrated 5-28 controller selection box, Capacity Expansion 1-8 illustrated 5-20...
  • Page 160 Index 11 changing RAID level 5-16, message F-4 5-18 1779 F-5 changing stripe size 5-16, failed drives F-1 5-18 power online spares E-4 applying 3-1 definition E-10 balancing load 2-5 limitations E-9 connecting 2-18 cord 2-18 operating systems drivers D-4, D-6 cycling F-5 optimized request failure 1-9...
  • Page 161 12 Compaq StorageWorks RAID Array 4100 User Guide read request 1-9 replacing 1-9 queuing, tagged-command 1-7, tagged-command 1-10 queuing 1-10 RA4000 Controllers features 1-7 SCSI formats supported 1-6 RA4000 RA4100 2-1 FC-AL D-5 cables 2-17 powering up 4-11 hard drives...
  • Page 162 SmartStart or Support StorageWorks RAID Array 1-1 Software CD 5-3 StorageWorks RAID Array 4100 2-2 installing materials needed 2-1 screwdrivers 2-1 StorageWorks RAID Array 4100 screws 2-10, 2-11 configuring 2-1 mounting 2-1 stripe size SCSI defined 5-26 bus 1-6 fault tolerance 5-26...
  • Page 163 14 Compaq StorageWorks RAID Array 4100 User Guide Array Configuration Utility 5-27 tables warnings Data Striping Options E-10 electrical shock xii RA4000 Controller LED rack stability xii Descriptions 4-3 Windows NT technical support xiii ADU F-1 telephone numbers xiv Capacity Expansion 1-8...

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