redundant

The ability of an array to maintain operability when one or more hardware failures occur.

 

RAID 1 array is an example of a redundant array. In the event of a drive failure, redundant

 

arrays can be restored to normal operation by replacing the failed drive and rebuilding the

 

array.

rescan

Process of updating the current screen to show all currently available resources.

segment

Disk drive or portion of a disk drive used to create a logical device. A disk can include RAID

 

segments and available segments. A RAID segment is part of a logical device; it can be used

 

by only one logical device at a time. Available segments can be used to define a new logical

 

device. If the disk is not part of any logical device, the entire disk is an available segment.

serial ATA (SATA)

A successor to ATA that uses a serial, instead of parallel, interface.

simple volume

A volume made up of disk space from a single disk. It can consist of a single region on a disk

 

or concatenated, multiple regions of the same disk.

single-level array

Array created from one or more partitions. See also volume, spanned volume, RAID signature,

 

and “RAID 1” on page 18.

spanned volume

A simple volume that spans two or more drives.

spare

See hotspare.

stripe

Contiguous set of data distributed across all the disks in an array. A striped array distributes

 

data evenly across all members in equal-sized sections called stripes.

stripe size

The amount of data in each section of a striped array.

striped array

See RAID signature and “RAID 5” on page 18.

task

An operation that occurs only on the RAID controller, asynchronous to all other operations; for

 

example, initializing a disk or verifying an array. Some tasks can take an extended period of

 

time, particularly if the RAID controller is also performing intensive data I/O while the task is

 

running.

verify

See consistency check command.

volume

See simple volume and spanned volume.

Glossary 24

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Image 24
HP 6-Port SATA RAID Or concatenated, multiple regions of the same disk, Single-level array, RAID 1 on, Stripe, Running