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There are typically two different applications where a Hot Plug is necessary.
Application 1.
The RAID 4/5 Array Drive is in the
ready
state.
It is likely that a drive will soon fail (for example when there is a loud operating noise). As a
preventative measure, this drive ought to be exchanged now, that is, in a moment when the
Array Drive is still in a ready state and still has redundancy.
Application 2.
The RAID 4/5 Array Drive is no longer fault tolerant (
fail
state), because a
drive of the Array Drive has actually failed. The Array Drive is still fully operational, but it
does not have redundancy any more. If another drive should also fail, the Array Drive's func-
tionality is impaired.
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We assume that there is a RAID 5 Array Drive which is fault tolerant. Its state is
ready
, all
drives are valid. After selecting the Array Drive, we choose the Replace Drive option.
A list of the Array Drive's components is displayed. For our example we choose No.1 for the
Hot Plug.
GDTMON scans the ICP Controller's SCSI Channels for drives which are still free (not yet
assigned to Logical Drives) and free (i.e., not occupied) SCSI Channels and SCSI IDs.
