HP Smart Array Cluster Storage System

Troubleshooting
HP Smart Array Cluster Storage System User Guide D-9
HP CONFIDENTAL
Writer: Rob Weaver File Name: j-appd Troubleshooting
Codename: Aurora Part Number: 240333-003 Last Saved On: 11/6/02 1:07 PM
6. Replace any failed drives.
7. After the failed drives have been replaced, the fault tolerance may again be
compromised. If so, cycle the power again, and if the #02 or #04 controller
display message is displayed, press the right push button. This action re-enables
the logical drive(s).
Automatic Data Recovery
Automatic Data Recovery is an automatic background process that rebuilds data onto
a spare or replacement drive when another drive in the array fails. The hard drive that
is being rebuilt flashes once per second.
If a drive in a fault-tolerant configuration is replaced while the system power is off, a
controller display message appears during the next system startup. Automatic Data
Recovery starts.
When Automatic Data Recovery is completed, the online LED of the replacement
drive stops flashing and illuminates steadily.
In general, the system requires approximately 15 minutes to rebuild each gigabyte.
The actual rebuild time depends upon the following:
• The rebuild priority level (high or low) of the logical drive
• The amount of I/O activity occurring during the rebuild operation
• The disk drive speed
• The number of drives in the array (for RAID 5 and RAID ADG)
For example, the rebuild time for 9-GB Wide-Ultra hard drives in a RAID 5
configuration varies from 10 minutes per gigabyte (for three drives) to 20 minutes per
gigabyte (for 14 drives).