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NStor Technologies Disk Array Enclosure Manuel d'utilisateur Page 79

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Glossary
67
Partition An array virtual disk made up of logical disks rather than
physical ones. Also called logical volume.
Physical Drive A physical array (or drive) is a collection of physical disks
governed by the RAID management software. A physical
drive appears to the host computer as one or more logical
drives.
RAID (Redundant Array of Independent Disks) An approach to
using multiple low cost drives as a group to improve
performance, yet also provide a degree of redundancy that
makes data loss remote.
RAID 0 Block “striping” is provided, yielding higher performance
than is possible with individual drives. This level does not
provide any redundancy.
RAID 1 Drives are paired and mirrored. All data is 100%
duplicated on an equivalent drive.
RAID 10 RAID 10 is a combination of RAID levels 0 and 1. The
data is striped across disks as in RAID 0. Each disk has a
mirror disk, as in RAID 1.
RAID 3 Data is striped across several physical drives. For data
redundancy one drive is encoded with rotated XOR
redundancy.
RAID 30 Data striping of two or more RAID 3 arrays. RAID level
30 is a combination of 0 and 3.
RAID 5 Data is striped across several physical drives. For data
redundancy drives are encoded with rotated XOR
redundancy.
RAID 50 RAID level 50 is a combination of RAID level 0 and 5.
AM RAID Controller This refers to the controller card that routes data to
and/or from the CPU. Disk array controllers perform all
RAID algorithms onboard the controller.
Rebuild The regeneration of all data from a failed disk in a RAID
level 1, 3, 5, or 6 array to a replacement disk. A disk
rebuild normally occurs without interruption of
application access to data stored on the array virtual disk.
Rotated XOR
Redundancy
This term (also known as “parity”) refers to a method of
providing complete data redundancy while requiring only
a fraction of the storage capacity for redundancy. In a
system configured under RAID 3 and 5, all data and
parity blocks are divided between the drives in such a way
that if any single drive is removed (or fails), the data on it
can be reconstructed using the data on the remaining
drives. (XOR refers to the Boolean “Exclusive-OR”
operator.)
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