HP D6000 Disk Enclosure - Manual (Page 33)

Troubleshooting 33
Time required for a rebuild
The time required for a rebuild varies considerably, depending on several factors:
• The priority that the rebuild is given over normal I/O operations (you can change the priority setting by
using ACU)
• The amount of I/O activity during the rebuild operation
• The rotational speed of the hard drives
• The availability of drive cache
• The brand, model, and age of the drives
• The amount of unused capacity on the drives
• The number of drives in the array (for RAID 5 and RAID 6 with ADG)
Allow approximately 1 minute per gigabyte for the rebuild process to be completed.
System performance is affected during the rebuild, and the system is unprotected against further drive failure
until the rebuild has finished. Therefore, replace drives during periods of low activity when possible.
CAUTION: If the Online LED of the replacement drive stops blinking and the amber Fault LED
glows, or if other drive LEDs in the array go out, the replacement drive has failed and is producing
unrecoverable disk errors. Remove and replace the failed replacement drive.
When automatic data recovery has finished, the Online LED of the replacement drive stops flashing and
begins to glow steadily.
Failure of another drive during rebuild
If a non-correctable read error occurs on another physical drive in the array during the rebuild process, the
Online LED of the replacement drive stops blinking and the rebuild abnormally terminates.
If this situation occurs, reboot the server. The system may temporarily become operational long enough to
allow recovery of unsaved data. In any case, locate the faulty drive, replace it, and restore data from
backup.