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Glossary 21
Glossary
activity See task.
array A logical disk created from available space and made up of one or more partitions on one or
more physical disks. Arrays are typically used to provide data redundancy or enhanced I/O
performance. See also container, volume, spanned volume, and RAID signature. Also known
as a container.
array initialization See initialize.
automatic failover See failover drive.
available
space/partition
Unused space on an initialized disk from which logical devices (arrays) are created. When an
array is deleted, the space that is used is returned to the available space pool.
background
consistency check
Consistency check performed as a background process. See also consistency check command.
bad partition Partition that is in an unknown state.
bootable array Array configured as the boot device.
build Background initialization of a redundant array. The array is accessible throughout. In a RAID
1 array, the contents of the primary drive are copied to a secondary drive. See also clear.
bus See channel.
cache Fast-access memory on the controller that serves as intermediate storage for data that is read
from, or written to, drives.
capacity Total usable space available in megabytes or gigabytes.
channel Any path, or bus, used for the transfer of data between storage devices and a RAID controller.
chunk See stripe.
clear Foreground initialization of a fault-tolerant array. A clear operation zeros all blocks of the
array. The array is not accessible until the clear task is complete.
concatenation Joining of physical or logical rives in sequential order.
consistency check
command
The controller continuously performs a verification on a redundant array to confirm data
integrity. In the case of RAID 1 or RAID 10 arrays, consistency checks assure that the data
between like blocks match. In the case of a RAID 5 array, consistency checks assure that data
in the stripe and the calculated parity for the stripe match.
container See array.
dead partition See failed.