Hardware Problems
2-28
HP Servers Troubleshooting Guide
HP CONFIDENTIAL
Writer: Ted Weiman File Name: c-ch2 Hardware Problems.doc
Codename: Generic TSG Part Number: 161759-007 Last Saved On: 11/19/02 9:31 AM
Unsafe Hot-Plug Drive Replacement Precautions
Be aware of the following guidelines cautioning unsafe hot-plug replacement:
•
Do not remove a drive if any other member of the array is offline (the online
LED is off). No other drive in the array can be hot-plugged without data loss.
The possible exception to this might be the utilization of RAID 0+1 as a
fault-tolerant form. In this case, drives are mirrored in pairs. More than one drive
can fail and be replaced as long as the drive or drives they are mirroring are
online.
Refer to your Smart Array Controller user guide for information on
fault-tolerance options.
•
Do not remove a drive if any member of an array is missing (previously removed
and not yet replaced).
•
Do not remove a drive if any member of an array is being rebuilt, unless the drive
being rebuilt has been configured as an online spare. The online LED for the
drive flashes, indicating that a replaced drive is being rebuilt from data stored on
the other drives.
If an online spare drive is installed, wait for rebuilding to complete before
replacing the failed drive. When a drive fails, the online spare becomes active
and begins rebuilding as a replacement drive. After the online spare has been
completely rebuilt, replace the failed drive with a new drive. Do not replace the
failed drive with the online spare.
NOTE:
An online spare does not activate and start rebuilding after a predictive failure
alert because the degraded drive is still online. The online spare activates only after a
drive in the array has failed.
•
Do not power down a server storage system while the server controlling it is
powered up.
CAUTION:
Powering down a server storage system while the server controlling
it is powered up causes the Smart Array controller to mark the drives as
failed
and results in permanent data loss.