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v A RAID level-1 logical drive
v A RAID level-1E logical drive
v A RAID level-5 llogical drive
If a physical drive in such an array fails, the RAID level-0 logical drives enter the
offline state, while the other logical drives enter the critical state.
After you replace the failed physical drive, a rebuild operation starts and
reconstructs the data stored in any RAID level-1, level-1E, or level-5 logical drives;
at the same time, the RAID level-0 logical drives enter the blocked state. RAID
level-0 logical drives cannot be rebuilt, since they do not contain redundant data.
After the rebuild operation is completed, you can unblock the RAID level-0 logical
drives and access them once again. However, the logical drive might contain
damaged data. You must re-create, reinstall, or restore the data from the most
recent backup disk or tape to the RAID level-0 logical drive.
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cluster
In ServeRAID Manager technology, two independent computer systems organized
into a network for the purpose of sharing resources and communicating with each
other. A cluster provides fault-tolerance at the server level.
compaction
The process by which a RAID level-5EE logical driveutilizes the distributed spare
drive in the event of a physical drive failure. After the data is reconstructed, the
original array undergoes compaction and the distributed spare drive becomes part
of the new array.
compression
The process by which a RAID level-5E logical drive utilizes the distributed spare
drive in the event of a physical drive failure. After the data is reconstructed, the
original array undergoes compression and the distributed spare drive becomes part
of the new array.
controller
A device that coordinates and controls the operation of one or more input/output
devices, such as workstations, and synchronizes the operation of such devices with
the operation of the system as a whole.
controller names
In a cluster or failover pair, the unique names that identify the members of the pair
to one another.
copy back
A method of restoring a logical drive’s original configuration after replacing a
failed drive in an array. Copy back restores the data to its original location, before
the logical drive was rebuilt from its spare.
262 ServeRAID Manager Installation and User's Guide