ICP RS Series User Manual page 180

The Array Drive is fully operational when in the ready state. All redundant information is
present, that is, a hard disk can fail without impairing the functionality of the Array Drive.
This is the normal state of an Array Drive. The state ready/expand indicates, that the RAID
level and/or capacity are currently migrated/expanded.
The idle state
RAID 4/5
This state is characterized by the fact that the redundant information of the Array Drive has
never been entirely created. The Array Drive is in this state after its first configuration. If an
error should occur while the array is in the build state, the array returns to the idle state
(exception: if during build mode the dedicated drive of a RAID 4 Array Drive fails, the state
changes to fail).
The build / rebuild state
RAID 1
After the Array Drive has been configured for the first time, and the build process is started
it assumes the build state. While the Array Drive is in the build state, redundancy informa-
tion is calculated and stored to the components of the Array Drive.
The disk array will assume the rebuild state after the automatic activation of a Hot Fix Drive
or after a manual replacement (Hot Plug). The data and the redundant information are re-
constructed and stored to the new drive.
In both states, the Array Drive is not redundant.
You can monitor the progress of the array build/rebuild by clicking the right mouse button
on the Host Drive and then selecting progress information.
Note: User traffic on an Array Drive which is in the build/rebuild state, slows down the
build/rebuild process.
The fail state
RAID 1
The Array Drive changes to the fail state whenever a Logical Drive fails. Redundancy infor-
mation is still present, thus allowing the remaining hard disks to continue working. This
state should be eliminated as soon as possible by replacing the defective hard disk. This
can be done by using a Physical Drive, which is already connected with the controller, but
not yet used for a Logical Drive, with the replace drive function, or by using the Hot Plug
Replace Drive function. If a Hot Fix Drive has previously been assigned to an Array Drive,
the ICP Controller will automatically replace the defective drive and start the reconstruction
of the data and the redundant information. Therefore, under these circumstances the fail
state is only temporary and will be eliminated by the controller itself.
Whenever an Array Drive enters a fail state, the ICP Controller's audible alarm is turned on.
You can silence the audible alarm in the physical configuration window.
To analyze the reason for the drive failure, the last status from the Physical Drive informa-
tion is very helpful. Additionally you should check for retries and/or reassigns.
A drive failure may also be the result of bad cabling, wrong termination or overheating.
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RAID 4/5
RAID 4/5