Compaq 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual
Advanced data guarding option software
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Summary of Contents for Compaq 166207-B21 - Smart Array 5302/32 RAID Controller
- Page 1 Compaq Advanced Data Guarding Option Software Reference Guide Part Number 283954-001 May 2002 (First Edition)
- Page 2 © 2002 Compaq Information Technologies Group, L.P. Compaq and the Compaq logo are trademarks of Compaq Information Technologies Group, L.P. in the U.S. and/or other countries. Microsoft, Windows, and Windows NT are trademarks of Microsoft Corporation in the U.S. and/or other countries. All other product names mentioned herein may be trademarks of their respective companies.
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Page 3: Table Of Contents
Contents About This Guide Symbols in Text........................v Text Conventions ......................vi Getting Help ........................vi Compaq Technical Support..................vi Compaq Website......................vii Compaq Authorized Reseller..................vii Reader’s Comments ......................vii Chapter 1 Overview of RAID ADG Comparing RAID ADG to Other RAID Methods............1-2 Probability of Logical Drive Failure................. - Page 4 Contents Compaq Advanced Data Guarding Option Software Reference Guide...
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Page 5: About This Guide
About This Guide This guide provides step-by-step instructions for installation, and reference information for operation, troubleshooting, and future upgrades for the Compaq Advanced Data Guarding Option Software. Symbols in Text These symbols may be found in the text of this guide. They have the following meanings. -
Page 6: Text Conventions
About This Guide Text Conventions This document uses the following conventions: • Italic type is used for complete titles of published guides or variables. Variables include information that varies in system output, in command lines, and in command parameters in text. •... -
Page 7: Compaq Website
About This Guide • Third-party hardware or software • Operating system type and revision level Compaq Website For information on this product, as well as the latest drivers and flash ROM images, go to www.compaq.com Compaq Authorized Reseller For the name of your nearest Compaq authorized reseller: •... -
Page 8: Overview Of Raid Adg
Overview of RAID ADG Advanced Data Guarding (RAID ADG) is a fault-tolerance method that uses two different and independent sets of parity data. A logical volume using this exceptionally high level of data protection can tolerate the simultaneous failure of two hard drives without suffering downtime or data loss. -
Page 9: Comparing Raid Adg To Other Raid Methods
Overview of RAID ADG Theoretically, RAID ADG can support a logical volume that spans over 200 hard drives without any great risk of data loss. However, currently existing array controllers and storage systems support no more than 14 drives per channel. Thus, the largest obtainable logical volume, using a 4-channel controller, spans 56 hard drives. -
Page 10: Probability Of Logical Drive Failure
Overview of RAID ADG Probability of Logical Drive Failure The probability that a logical drive will fail depends on the RAID level setting. • A RAID 0 logical drive will fail if only one physical drive fails. • For a RAID 1+0 logical drive, the failure situation is complex. —... - Page 11 Overview of RAID ADG RAID 0 RAID 5 RAID 1+0 RAID ADG Total number of physical drives in array Figure 1-2: Relative probability of logical drive failure for different RAID levels Compaq Advanced Data Guarding Option Software Reference Guide...
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Page 12: Choosing A Raid Method
Overview of RAID ADG Choosing a RAID Method There are three primary reasons for using RAID ADG: • You need greater fault tolerance than RAID 5 can provide but you also want to use as much drive space as possible for data. •... -
Page 13: System Setup
System Setup Enabling RAID ADG Before you can configure an array with RAID ADG, you must enable the array controller to use this feature. The most convenient method of doing this is to install a software key on the server. NOTE: Older versions of the Smart Array 5300 Controller can also be enabled for RAID ADG by a hardware enabler module that plugs into the array controller board. - Page 14 System Setup This action opens ACU-XE, the browser-based version of the Compaq Array Configuration Utility (ACU). IMPORTANT: Use the version of ACU-XE that is provided on the CD. The software key cannot be installed using versions of ACU-XE earlier than 1.40, nor can it be installed using ACU.
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Page 15: Configuring The System With Raid Adg
System Setup Configuring the System with RAID ADG The procedure for configuring a system with RAID ADG depends on whether it is a new system and what operating system it uses. This section gives an overview of the procedure. For more detailed information, refer to the user guide for the array controller that the system is using. - Page 16 System Setup 2. Select the hard drives that are to make up the array, remembering to leave any that you want to use as online spares. 3. Click the Assign Drive to Array button in the upper middle part of the screen. 4.
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Page 17: Migrating An Existing Logical Drive To Raid Adg
System Setup 4. If you want to use the wizard, select RAID ADG as the fault-tolerance level. Alternatively, exit the wizard and custom configure the system. 5. Save the changes and exit CPQONLIN. Migrating an Existing Logical Drive to RAID ADG Before migrating a logical drive that is currently configured for RAID 0 or RAID 5, you must expand the array. - Page 18 System Setup 9. Click the Assign Spare to Array button in the lower middle part of the screen. 10. Continue the migration when expansion has finished. Migrating the Logical Drive 1. In ACU, click Migrate in the Logical Drive box in the lower right corner of the main ACU screen.
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Page 19: Migrating A Raid Adg Volume To Another Controller
System Setup 9. Change the stripe size if desired. The “Optimizing the Stripe Size” section discusses the stripe sizes that are most useful for various applications. 10. Press the Esc key to save the changes and begin the migration. Migrating a RAID ADG Volume to Another Controller You can migrate a RAID ADG logical volume only if both controllers support RAID ADG. -
Page 20: Performance Tuning
System Setup 2. Double-click the ACU icon on the desktop. 3. Select the controller from the drop-down list on the main ACU screen. 4. Select the array. 5. Click Modify in the Array box. 6. Select the drives that are to be used as online spares. IMPORTANT: The capacity of an online spare should be no less than that of any other drive in the same array. -
Page 21: Changing The Cache Read/Write Ratio
System Setup • Change to a stripe size that is more suitable for the type of data transfer common to the system. • Change the RAID level to one that requires less RAID overhead. • Enlarge the logical drive to span all available controller channels. Changing the Cache Read/Write Ratio By default, the array accelerator cache capacity is equally divided between reads and writes. - Page 22 System Setup Table 2-1: Supported Stripe Sizes for a Given RAID Level Fault-tolerance Level Supported Stripe Sizes (KB) Default (KB) RAID 0 or 1+0 8, 16, 32, 64, 128, 256 RAID 5 or ADG 8, 16, 32, 64 Table 2-2: Optimum Stripe Size Type of Server Application Suggested Stripe Size Change Mixed read/write...
- Page 23 System Setup NetWare 1. Visit the Novell website and be sure that the latest support pack or operating system patch is installed on the system. 2. Visit the Compaq website and be sure that you have the latest drivers for the controller that is installed in the system.