ICP RS Series User Manual page 131

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"Rebuild" State
The disk array will assume this state after the automatic activation of a Hot Fix drive or after
a manual replacement carried out with ICPCON. The data and the redundant information
are reconstructed and stored to the new drive.
"Expand" State
If the capacity or RAID level of an existing disk array is changed, the disk array changes its
state into expand. As soon as the expansion or migration is completed, the state changes
back to ready.
"Error" State
If a second hard disk should fail while the disk array is in the fail or rebuild state, it is not
possible to continue the working session without restrictions. The disk array is still avail-
able for I/Os, but data loss and error messages on the host level are possible.
The following state diagram of the disk array summarizes the states described above and
the transitions from one state to another.
Some of these states may become the addendum patch (e.g. build/patch, ready/patch).
This word indicates that the original Array Drive went through a significant procedure. I.e.,
the parity information was recalculated anew.
Or, the Array Drive has been patched from the error state into the fail state. This may be-
come extremely helpful in a situation where two Logical Drives of an Array Drive, fail at the
same time, but only one of the two Logical Drives is really defective and the other was
blocked out, since it was connected with the same SCSI channel as the defective one. The
Array Drive's state is error and normally all data would be lost. The ICP Controllers include
some functions, which allow the patch of this Array Drive from the error state into the fail
sate. Before the actual patch, the defective drive has to be physically removed from the Ar-
ray Drive. Such a patch-procedure is a real sheet-anchor and should only be used, after a
detailed consultation with a trained support person (a printout of the Save Information file, is
extremely helpful).
Pressing F4 delivers level by level detailed information on a Host Drive and its compo-
nents. This may assist to get an easy overview of a specific Host Drive. After pressing F5 the
ICP Controller switches the LEDs (if available) of the hard disks belonging to that Host
Drive on and off.
After selecting „Configure new Host Drive", the ICP Controller scans all channels for free
hard disks (i.e., hard disks which are not yet part of a Host Drive) and displays these units
in a list. Use the Space bar to select/deselect hard disks and the cursor up down keys to
move the selection bar from one hard disk to another. Marked hard disks show an "*" in the
first column. In the choose Type windows all possible Host Drive types are displayed (the
possible types depend on the number of selected hard disks and the firmware level of the
ICP Controller).