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Use the TIER command to display the current setting (Figure 3–26). The rebuild operation can take up
to several hours to complete, depending on the size of the disk and rate of rebuild.
Figure 3–26 Automatic Disk Rebuilding Parameter
TIER AUTOREBUILD=ON|OFF enables/disables the automatic disk rebuild function. A disk will only
be replaced by a spare disk if it fails and Autorebuild is ON (ON being the default setting). This function
should always be enabled so that data can be reconstructed on the spare drive when a drive failure occurs.
After the failed drive is replaced, data will be automatically copied from the spare drive to the
replacement drive.
3.2.10.1 Manual Drive Rebuild
DISK REBUILD=<tier><channel> initiates a rebuild on a specific drive. This operation will reconstruct
data on the replacement drive and restore a degraded LUN to healthy status.
3.2.10.2 Drive Rebuild Verify
DISK REBUILDVERIFY=ON|OFF determines if the system will send SCSI Write with Verify
commands to the disks when rebuilding failed disks. This feature is used to guarantee that the data on the
disks is rebuilt correctly. Default is OFF. This feature will increase the time it takes for rebuilds to
complete.
3.2.10.3 Manual Drive Replace
To replace the specified failed drive with a spare drive, enter: DISK REPLACE=<tier><channel>
A Replace operation is used to temporarily replace a failed disk with a healthy spare disk.
3.2.10.4 Interrupting a Rebuild Operation
To interrupt a Rebuild operation, use these commands:
• TIER PAUSE pauses the current rebuild operations.
• TIER RESUME releases the paused rebuild operations.
• TIER STOP aborts all the current rebuild operations.
3.2.11 SMART Command
Use the SMART command to identify failing drives before they fail.
Tier Status
Space Available
(Mbytes)Owner Disk Status Lun List
Capacity
(Mbytes)
ABCDEFGHPS
-------------------------------------------------------------------
280012280012
ABCDEFGHPS280012280012
ABCDEFGHPS280012280012
Automatic disk rebuilding is Enabled
15000 [1]: tier
System rebuild extent: 32 Mbytes
System Capacity 840036 Mbytes, 840036 Mbytes available.
System rebuild delay: 60
Tier
1
2
3