Unsafe Hot-Plug Drive Replacement Precautions - Compaq N2400 - TaskSmart - 1 GB RAM Administration Manual

Unsafe Hot-Plug Drive Replacement Precautions

Be aware of the following Compaq guidelines cautioning unsafe hot-plug
replacement.
Do not remove a degraded 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 that they are mirroring are online.
Refer to your Smart Array Controller user guide for information on
fault-tolerance options.
Do not remove a degraded drive if any member of an array is missing
(previously removed and not yet replaced).
Do not remove a degraded 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.
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 replace multiple degraded drives at the same time (for example,
when the system is off), because the fault tolerance may be
compromised. When a drive is replaced, the controller uses data from
the other drives in the array to reconstruct data on the replacement drive.
If more than one drive is removed, a complete data set is not available to
reconstruct data on the replacement drive or drives and permanent data
loss can occur.
CAUTION: Do not power down a storage enclosure when the server containing
the Smart Array Controller is powered up. Also, do not power up the server
before powering up the storage enclosure. If these ordering rules are not
followed, the Smart Array Controller can mark the drives in the storage
enclosure as "failed," which can result in permanent data loss.
Troubleshooting C-5