Rebuilding Data; The Autorebuild Feature - HP P3410A - NetRAID 1M RAID Controller User Manual

Chapter 5

Rebuilding Data

If a disk drive fails in an array that is configured as a RAID 1, 3, 5, 10, 30, or 50
logical drive, you can recover the lost data by rebuilding the drive. If you have
configured one or more hot spares, the drive can be rebuilt automatically. If you
have not configured any hot spares, you can remove the failed drive, install a new
one, and the HP NetRAID system begins rebuilding your data automatically.
A configuration of RAID 1, 3, 5, 10, 30, or 50 has built-in redundancy. If a drive
in one of these RAID levels fails, the RAID subsystem continues to work, but no
additional redundancy is provided. Another drive failure will cause data loss. The
rebuild process goes on in the background without stopping the HP NetRAID
system. (However, performance may be affected during the rebuild process.)
NOTE For information on about replacing a hard drive with another
hard drive, refer to your HP NetServer documentation.

The Autorebuild Feature

The Autorebuild feature detects the availability of a hot spare or the replacement
of a failed disk drive and automatically rebuilds onto it the data that was on the
failed disk. For Autorebuild to occur, all of the following conditions must be
satisfied:
A hot spare was configured, or the failed drive was replaced with a good
drive in the same physical slot as the failed drive.
The replacement drive capacity is at least as large as the failed drive
capacity.
The drive to be rebuilt contains one or more logical drives of RAID level
1, 3, 5, 10, 30, or 50. The drive cannot contain a RAID 0 logical drive.
Autorebuild is enabled. (This is the default setting.)
If any of the conditions are not met, the HP NetRAID firmware cannot rebuild the
drive automatically. In this case, you must initiate a manual rebuild. See
"Rebuilding Drives Manually" in this chapter for instructions.
102
Reconstructing and Rebuilding Drives