Compaq 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual
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Compaq 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual

Compaq 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual

Advanced data guarding for the smart array controller
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Advanced Data Guarding for the
Smart Array 5300 Controller
Reference Guide
First Edition (December 2000)
Part Number 188270-001
Compaq Computer Corporation

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Summary of Contents for Compaq 166207-B21 - Smart Array 5302/32 RAID Controller

  • Page 1 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide First Edition (December 2000) Part Number 188270-001 Compaq Computer Corporation...
  • Page 2 Notice © 2000 Compaq Computer Corporation COMPAQ, the Compaq logo, SmartStart, registered United States Patent and Trademark Office. SoftPaq is a trademark of Compaq Information Technologies Group, L.P. Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation. All other product names mentioned herein may be trademarks and/or registered trademarks of their respective companies.

  • Page 3: Table Of Contents

    Contents About This Guide Text Conventions ......................v Symbols in Text ......................vi Symbols on Equipment ....................vi Important Safety Information ..................vii Getting Help ......................vii Compaq Technical Support................vii Compaq Website ....................viii Compaq Authorized Reseller ................viii Chapter 1 Introduction: RAID ADG Chapter 2 Installation Preliminary Steps .....................2-1...
  • Page 4 iv Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide System Setup continued Performance Tuning ....................3-7 Changing the Cache Read/Write Allocation............. 3-7 Optimizing the Stripe Size................3-8 Changing the Fault Tolerance Mode .............. 3-10 Appendix A Regulatory Compliance Notices Federal Communications Commission Notice ............A-1 Class A Equipment...................A-2 Class B Equipment ...................A-2...

  • Page 5: About This Guide

    About This Guide This guide describes the features of RAID ADG and the installation of the RAID ADG Enabler Module onto the Smart Array 5300 controller board. Text Conventions This document uses the following conventions to distinguish elements of text: Keys Keys appear in boldface.

  • Page 6: Symbols In Text

    vi Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide 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.

  • Page 7: Important Safety Information

    About This Guide vii 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 8: Compaq Website

    viii Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Be sure to have the following information available before you call Compaq: Technical support registration number (if applicable) Product serial number (s) Product model name(s) and numbers(s) Applicable error messages Add-on boards or hardware Third-party hardware or software Operating system type and revision level...

  • Page 9: Introduction: Raid Adg

    Chapter Introduction: RAID ADG RAID ADG is similar to RAID 5 in that data protection is achieved by writing parity information to the physical drives in the array. With RAID ADG, however, two sets of parity data are used (Figure 1-1). These two sets are different, and each set occupies a capacity equivalent to that of one of the constituent drives.
  • Page 10 1-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide The main advantages of RAID ADG are: High read performance High data availability – any two drives can fail without loss of critical data The only significant disadvantage is a relatively low write performance (lower than RAID 5), due to the need for two sets of parity data.
  • Page 11 Introduction: RAID ADG 1-3 RAID L OST IMPORTANT LSO IMPORTANT UGGESTED EVEL Cost effectiveness RAID ADG Fault tolerance RAID 0+1 I/O performance Fault tolerance RAID ADG Cost effectiveness RAID 5 (RAID 0 if fault I/O performance tolerance is not required) RAID 5 (RAID 0 if fault Cost effectiveness tolerance is not required)

  • Page 12: Installation

    Chapter Installation For Advanced Data Guarding to be available as a fault-tolerance option on your system, the RAID ADG Enabler Module must be installed on the Smart Array 5300 controller in the server. Also, you will need to have at least 64 MB of read/write cache on the controller.

  • Page 13: Locating The Connector

    2-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide 2. Turn off the server. 3. Turn off any peripheral devices attached to the server. 4. Unplug the AC power cord from the outlet, then from the server. 5.

  • Page 14: Installing The Raid Adg Enabler Module

    Installation 2-3 Figure 2-2. Aligning the module on the controller board Installing the RAID ADG Enabler Module To install the RAID ADG Enabler Module: 1. Perform the preliminary steps described earlier in this chapter. 2. Ensure that the Array Accelerator on your Smart Array 5300 controller has at least 64 MB of read/write cache.

  • Page 15: Removing The Enabler Module

    2-4 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide 4. Use one thumb to press the tab at the top of the rear end outward 2(a) while using the other thumb to gently press the other end of the module 2(b) into the connector and slot on the controller board.

  • Page 16: System Setup

    Chapter System Setup When you have installed the RAID ADG Enabler Module, your array controller can be configured to use Advanced Data Guarding. The greater reliability of RAID ADG (see Appendix C) allows an array to be built with up to 56 drives, spanning all four channels of a Smart Array 5300 controller and its attached 2- to 4-channel adapter board.

  • Page 17: Configuring A New System For Raid Adg

    3-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Configuring a New System for RAID ADG Windows NT and Windows 2000 There are three main steps to configure a new system for RAID ADG: 1. Set up an array. 2.

  • Page 18: Netware

    System Setup 3-3 Creating a Logical Drive within the Array 1. Select the array from the left-hand side of the main ACU screen. 2. Click the Create Logical Drive button 3. Select the RAID ADG check box on the screen that is displayed. 4.

  • Page 19: Migrating An Existing Logical Drive To Raid Adg

    3-4 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Migrating an Existing Logical Drive to RAID ADG Windows NT and Windows 2000 If you are migrating from a logical drive that is configured for RAID 0 or RAID 5, you will need to expand the array before migrating to RAID ADG.

  • Page 20: Netware

    System Setup 3-5 3. Change the stripe size, if required. The default setting is 16 kB for RAID ADG, suitable for most common uses. The Stripe Size section later in this chapter discusses stripe sizes most useful for various applications. 4.
  • Page 21 3-6 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide more hard drives will fail before the failed drive is replaced, leading to failure of the complete logical drive and consequent loss of data. This is less likely with RAID ADG than RAID 5, since RAID ADG can sustain failure of two drives.

  • Page 22: Performance Tuning

    System Setup 3-7 9. In the Rebuild Priority section of the Controller Settings screen, select High if rebuilding data is more important than handling operating system requests; select Low if the controller should rebuild data only when it is idle. IMPORTANT: Selecting a high rebuild priority will result in reduced server performance while the rebuild is in progress.

  • Page 23: Optimizing The Stripe Size

    3-8 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide 4. Click the Settings button in the Controller section on the right side of the Main ACU screen. 5. In the Accelerator Ratio section of the Controller Settings screen that is displayed, either click a check box by one of the choices offered or enter a percentage in one of the fields.
  • Page 24 System Setup 3-9 To change the stripe size, carry out the procedure described for your operating system in one of the following sections. Windows NT and Windows 2000 1. Check that you have the latest version of the configuration utility by visiting the Compaq website (www.compaq.com).

  • Page 25: Changing The Fault Tolerance Mode

    3-10 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Changing the Fault Tolerance Mode Performance decreases in this order: RAID 0 (highest performance, but no protection against drive failure) RAID 1 RAID 5 RAID ADG If performance is too low with your current fault tolerance method, it can be improved by migrating to a different RAID level.

  • Page 26: Regulatory Compliance Notices

    Appendix Regulatory Compliance Notices Federal Communications Commission Notice Part 15 of the Federal Communications Commission (FCC) Rules and Regulations has established Radio Frequency (RF) emission limits to provide an interference-free radio frequency spectrum. Many electronic devices, including computers, generate RF energy incidental to their intended function and are, therefore, covered by these rules.

  • Page 27: Class A Equipment

    A-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Class A Equipment This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.

  • Page 28: Modifications

    Regulatory Compliance Notices A-3 For questions regarding your product, contact: Compaq Computer Corporation P. O. Box 692000, Mail Stop 530113 Houston, Texas 77269-2000 or call 1-800- 652-6672 (1-800-OK COMPAQ). (For continuous quality improvement, calls may be recorded or monitored.) For questions regarding this FCC declaration, contact: Compaq Computer Corporation P.

  • Page 29: Class B Equipment

    A-4 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Class B Equipment This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

  • Page 30: Taiwanese Notice

    Regulatory Compliance Notices A-5 Taiwanese Notice...

  • Page 31: Electrostatic Discharge

    Appendix Electrostatic Discharge A discharge of static electricity from a finger or other conductor can damage printed circuit boards or other static-sensitive devices. This type of damage may reduce the life expectancy of the device. Preventing Electrostatic Damage To prevent electrostatic damage, observe the following precautions: Avoid hand contact by transporting and storing parts in static-safe containers.

  • Page 32: Grounding Methods

    B-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Grounding Methods There are several methods for grounding. Use one or more of the following measures when handling or installing electrostatic-sensitive parts: Use a wrist strap connected by a ground cord to a grounded workstation or the computer chassis.

  • Page 33: Reliability Data

    Appendix Reliability Data Figure C-1 shows the relative probability of logical drive failure for different RAID settings and different logical drive sizes, assuming no online spares are present. With RAID 0, the logical drive will fail if only one physical drive fails;...
  • Page 34 C-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Total number of physical drives in array RAID 0 0.01 0.001 RAID 5 0.0001 1E-05 RAID 0+1 1E-06 RAID ADG 1E-07 1E-08 1E-09 1E-10 1E-11 Figure C-1. Probability of logical drive failure for different RAID levels...
  • Page 35 Appendix Additional POST Error Messages If a system fault is present when the computer is started up, Power-On Self- Test messages will display. Many of these messages are self-explanatory and suggest corrective actions. Messages unique to the use of RAID ADG are listed in the following table.

  • Page 36: Questions And Answers

    Appendix Questions and Answers Q: What is RAID ADG? A: RAID ADG is an extension of RAID 5 that allows additional fault tolerance by using two different and independent parity schemes. Data is striped across a set of hard drives, just as with RAID 5, and the two sets of parity data are calculated and written across all the drives in the array.
  • Page 37 E-2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Q: What is the difference between RAID ADG and RAID 0+1? A: RAID ADG uses the capacity of only two hard drives for fault tolerance, regardless of the size of the RAID volume. This means a lower cost of implementation for six or more drives.
  • Page 38 Index activating RAID ADG E-2 data rebuild time 3-6 added security with online Declaration of Conformity A-2 spare C-1 default stripe size 3-8 Array Configuration Utility drive failure probability graph C-1 assigning an online spare 3-6 changing cache read/write ratio 3-7 enabler module source 3-4 assigning an online spare 3-6...
  • Page 39 2 Advanced Data Guarding for the Smart Array 5300 Controller Reference Guide Reference Guide number of hard drives per logical drive C-1 hard drives number of hard drives maximum number per logical supported C-1 drive C-1 number of online spares per help array 3-6 additional sources vii...
  • Page 40 Index 3 table warnings available stripe size 3-8 electrical shock vii optimum stripe size 3-8 installation 2-1 POST error messages D-1 shutting down system 2-1 RAID features 1-2 website, Compaq viii Taiwanese notice A-5 technical support vii telephone numbers viii text conventions v tuning performance 3-7...

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