9.5.01 HP P4000 SAN Solution User Guide (AX696-96168, February 2012)

• Powering the disk on in the CMC (non-hot-swap storage systems)
• Rebuilding RAID on the disk or on the storage system (all storage systems)
NOTE: Because of the nature of the SSD drive wear management and reporting, it is likely that
all the SSD drives in a system will wear out around the same time.
Table 12 (page 45) lists disk replacement requirements for specific configurations and storage
systems.
Table 12 Disk replacement requirements
RequirementsStorage system or configuration
RAID is normal and Safe to Remove status is yes. See
“Replacing disks in hot-swap storage systems” (page 45).
Hot-swap storage systems configured for RAID 1, 10, 5,
50, or 6
Replace disk on host server according to manufacturer's
instructions.
VSA
Additional information about preparing for disk replacement is included in the following sections
below:
• “Preparing for a disk replacement” (page 46)
• “Best practice checklist for single disk replacement in RAID 1, RAID 10, RAID 5, and RAID 6
” (page 46)
Using Repair Storage System
Repair Storage System is a procedure that allows you to replace a disk and trigger only one resync
of data, rather than a complete restripe. Repair Storage System creates a place-holder system in
the cluster, while allowing the storage system needing repair to be removed for the disk replacement.
See “Repairing a storage system” (page 139) for more information.
In the following circumstances, you may have to use the Repair Storage System feature when
replacing disks.
• When replacing multiple disks on a storage system with RAID 5 or RAID 6
• When multiple disks on the same mirror set need to be replaced on a storage system with
RAID 10.
Replacing disks in hot-swap storage systems
In hot-swap storage systems configured with RAID 1, RAID 10, RAID 5, or RAID 6, a faulty or failed
disk can be removed and replaced with a new one. RAID will rebuild and the drive will return to
Normal status.
CAUTION: Before replacing a drive in a hot-swap storage system, always check the Safe to
Remove status to verify that the drive can be removed without causing RAID to go Off.
When RAID is Normal in RAID 1, RAID 10, RAID 5, or RAID 6, all drives indicate they are safe
to remove. However, you should only replace one drive at a time. If it is necessary to replace more
than one drive, always check the Safe to Remove status again. Wait up to two minutes for the
status to fully update before checking it again. If the status indicates the second drive is safe to
remove, then it can be replaced.
For example, if an array is Rebuilding, no other drives in the array (except for unused hot-spare
drives) are safe to remove. However, if the configuration includes two or more arrays and those
arrays are Normal, the Safe To Remove status indicates that drives in those other arrays may be
replaced.
Replacing a disk 45