User guide

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...........................................................................................E-11
Concurrent I/O Request Servicing..................................................................E-13
Optimized Request Management....................................................................E-13
Expanding Storage Capacity..................................................................................E-14
Online Capacity Expansion............................................................................E-16
Hard Drive Upgrades......................................................................................E-16
Other Fault Management Features.........................................................................E-17
Auto Reliability Monitoring...........................................................................E-17
Dynamic Sector Repairing..............................................................................E-17
Drive Parameter Tracking...............................................................................E-17
Drive Failure Alert Features...........................................................................E-18
Interim Data Recovery....................................................................................E-18
Automatic Data Recovery...............................................................................E-18
Appendix F
Recovering From Hard Drive Failure
Recognizing a Drive Failure....................................................................................F-1
Fault Tolerance and Drive Failure...........................................................................F-2
Non-Fault-Tolerant (RAID 0) Logical Drive ...................................................F-2
RAID 1 (Mirroring) Logical Drive...................................................................F-2
Spare Drives.....................................................................................................F-3
Replacing a Failed Drive.........................................................................................F-3
Automatic Data Recovery.................................................................................F-4
Automatic Data Recovery Failure....................................................................F-4
Compromised Fault Tolerance.................................................................................F-5
Index