Table of Contents
Advertisement
Mirroring
A form of RAID in which Array Management Software maintains two or more identical copies of
data on separate disks.
MTBF
An abbreviation for Mean Time Between Failure, the average time from start of use to failure in
a large population of identical components or devices.
RAID
A Redundant Array of Independent Disks (RAID or RAID array) is a disk array in which part of
the storage capacity is used to store redundant information about user data stored on the
remainder of the storage capacity. The redundant information enables regeneration of user data in
the event that one of the array member disks or the access path to it fails.
RAID levels
The original RAID level 1 through 5 was outlined in a research paper entitled A Case for
Redundant Arrays of Inexpensive Disks.
This paper was published in 1988 by David A.
Patterson, Garth Gibson, and Randy H. Katz of the University of California at Berkley.
Counting the term RAID 0 that refers to disk striping and later defined RAID 6, there are 7 levels
of RAID.
SCSI
Small Computer System Interface.
Spare, Spare Disk
A disk reserved for the purpose of substituting for a like entity in case of failure of that entity.
Swap
The installation of a replacement unit in place of a defective unit. Units are parts of a disk
controller that may either field replaceable by a vendor service representative or consumer
replaceable.
77
Advertisement
Table of Contents
