HP 5300 - Manual (Page 124)

Hard Drive Installation and Replacement
HP Smart Array 5300 Controller User Guide E-7
HP CONFIDENTIAL
Writer: Jennifer Hayward File Name: o-appe hard drive installation and replacement
Codename: SilverHammer Part Number: 135606-005 Last Saved On: 10/8/02 11:22 AM
There are several other factors to remember when replacing a hard drive:
• Non-hot-pluggable drives should only be replaced while the system is powered
down.
• Hot-pluggable drives can be removed and replaced at any time, whether the host
or storage system power is on or off.
When a hot-pluggable drive is inserted, all disk activity on the array pauses while
the new drive is spinning up (usually 20 seconds or so). If the drive is inserted
while power is on, in a fault-tolerant configuration, data recovery onto the
replacement drive begins automatically (indicated by the blinking Online LED).
• Replacement drives must have a capacity no less than that of the smallest drive in
the array. Drives of insufficient capacity will be failed immediately by the
controller before automatic data recovery can begin.
• When you set the SCSI ID jumpers manually, check the ID value to be sure that
the correct physical drive is being replaced. Set the same ID value on the
replacement drive to prevent SCSI ID conflicts.
CAUTION: In systems using external data storage, take care that the server is the
first unit to be powered down and the last to be powered back up. Doing this ensures
that the system will not erroneously mark the drives as failed.
The rebuild operation takes several hours, even if the system is not busy while the
rebuild is in progress. System performance and fault tolerance are both affected until
the rebuild has finished. Therefore, replace drives during low activity periods
whenever possible. In addition, be sure that all logical volumes on the same array as
the drive being replaced have a current, valid backup.
Drive Failure During Rebuild
If another drive in the array fails while fault tolerance is unavailable during rebuild, a
fatal system error may occur. If this happens, all data on the array is lost. In
exceptional cases, however, failure of another drive need not lead to a fatal system
error. These exceptions include:
• Failure after activation of a spare drive