Removal and Replacement Procedures
Hot-Plug SCSI Hard Drives
Drive Replacement Precautions
Be aware of the following guidelines cautioning unsafe hot-plug replacement.
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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 is hot-pluggable without data loss. The exception
to this is the use of RAID 1+0 as a fault-tolerant configuration. 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.
Do not remove a degraded drive if any member of an array is missing (removed
previously 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 green or amber, indicating that a replaced drive is being rebuilt from the data
stored on the other drives.
NOTE: An online spare drive 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, since the fault tolerance can 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 turn off any external unit when the server containing. A Smart Array
controller is powered up. Also, do not power up the server before powering up the drive
enclosure. If these ordering rules are not followed, the Smart Array controller may mark
the drives in this enclosure as failed, resulting in permanent data loss.
HP ProLiant DL580 Generation 2 Server Maintenance and Service Guide 2-31
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