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Compaq StorageWorks RAID Array 4000 User Guide
■
Disk failure will result in data loss for all RAID 0 logical drives.
■
You cannot assign an online spare to an array containing a RAID 0
logical drive.
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.
The controller also sends data that it would normally store on the failed drive
directly to the online spare.
The online spare improves the overall system fault tolerance by automatically
replacing a failed drive and quickly restoring the system to full RAID fault
tolerance protection. During the time the system is operating in interim
recovery mode with the failed drive, the system is vulnerable to an additional
drive failure.
You can install up to four online spares for each array controller. To provide
an online spare, you must have at least one installed but unassigned physical
drive and the system must be running some type of fault-tolerance method
(RAID 1, RAID 4, or RAID 5).
Drive arrays allow data access performance to be dramatically enhanced over
non-arrayed drives. In addition, several other performance enhancement
features are discussed here.
Distributing data makes it possible to access data concurrently from multiple
drives in an array. This yields I/O rates many times faster than non-arrayed
drives. Distributing data allows data striping.
Data striping is generated automatically on an array to store user data. A stripe
is a collection of contiguous data that is distributed evenly across all physical
drives in a logical drive. The width of the stripe (the amount stored on each
physical drive) can be selected when the logical drive is created. The
following table shows the valid stripe sizes for each RAID level supported.
Default values are shown in bold.
- 1
- Fourth Edition (June 1999) 2
- Part Number 241377-004 2
- Chapter 1 3
- Chapter 2 4
- Chapter 3 4
- Chapter 4 5
- Chapter 5 5
- Chapter 6 5
- Chapter 7 6
- Appendix A 6
- Appendix B 6
- Appendix C 7
- Appendix D 7
- Appendix E 7
- Appendix F 8
- About This Guide xi 11
- TROJ001.EPS 14
- TROJ002.EPS 14
- Introduction 15
- TROJ006.EPS 20
- Installation 28
- TROJ032.EPS 35
- TROJ034.eps 37
- TROJ011.EPS 47
- TROJ017.EPS 49
- Operation 50
- DO NOT REMOVE THE DRIVE 53
- Troubleshooting 56
- 1514 13 12 11 10 9 8 57
- 76 54 32 10 57
- TROJ044.EPS 82
- Figure 6-5. Example Array A 92
- Configuration Utility 93
- Figure 6-18. Controller box 107
- Figure 6-19. Array buttons 108
- Some tips for expanding are: 118
- Specifications 133
- ■ Higher Performance 134
- ■ Connectivity Improvement 134
- Fibre Channel Technology 136
- Hard Drive Arrays 146
- WAR2-052.AI, 9-2.EPS 151
- P = Parity 151
- ■ Hot-pluggable drives 159
- Index 3 169
- Index 5 171
- Index 7 173
- Index 9 175
- Index 11 177
- Index 13 179
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