HP Surestore Disk Array FC60 HP SureStore E Disk Array 12H User's and Service - Page 267

RAID stands for Redundant Array of Independent Disks. The disk, RAID 0/1, RAID 5, Read Verify

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Glossary Glossary RAID RAID stands for "Redundant Array of Independent Disks." The disk array implements this technology to connect several disk drives to one Disk Array Controller. Several different forms of RAID implementations have been defined. The RAID implementations supported by the disk array include RAID 0/1 and RAID 5. RAID 0/1 RAID 0/1 is a disk array operating mode that provides high performance, but is somewhat inefficient in its use of disk space. RAID 0/1 implements Data Redundancy by keeping a separate copy of all data. This "mirroring" technique consumes half of the disk capacity for Data Redundancy, but provides maximum performance for servicing disk writes. Distributing data across all disks, called Block Mirroring, provides a performance boost. RAID 5 A disk array operating mode that is efficient in its use of disk space, but suffers a performance penalty when performing write I/Os. As the disk array begins to fill up, less frequently updated data is moved to RAID 5 space. Read Verify A diagnostic test that checks the integrity of the disk media by reading data from random locations on the disk. A Read Verify test is nondestructive; that is, it will not alter or destroy any of the data on the disk. The disk undergoing the test remains in use by the disk array while the test is in progress. Rebuild A Rebuild is the process of recovering data that was on a failed disk. The disk array reconstructs the data that was on the failed disk using redundant data from the remaining disks. Until a Rebuild is complete, the disk array is operating in a non-redundant mode, and is vulnerable to a second disk failure. See also Auto Rebuild. Rebuild Priority Rebuild Priority sets the priority of a Rebuild equal to (high) or lower than (low) host I/Os. The Rebuild Priority is able to balance the speed of the Rebuild with host system performance. Recommended Operating Range The range of temperature, humidity, vibration, shock, and altitude, recommended for extended periods of operation of a disk array. See Maximum Environmental Limit. Redundancy See Data Redundancy. 267

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Glossary
267
Glossary
RAID
RAID stands for “Redundant Array of Independent Disks.” The disk
array implements this technology to connect several disk drives to one
Disk Array Controller. Several different forms of RAID
implementations have been defined. The RAID implementations
supported by the disk array include
RAID 0/1
and
RAID
5
.
RAID 0/1
RAID 0/1 is a disk array operating mode that provides high
performance, but is somewhat inefficient in its use of disk space. RAID
0/1 implements
Data
Redundancy
by keeping a separate copy of all
data. This “mirroring” technique consumes half of the disk capacity for
Data
Redundancy
, but provides maximum performance for servicing
disk writes. Distributing data across all disks, called
Block
Mirroring
,
provides a performance boost.
RAID 5
A disk array operating mode that is efficient in its use of disk space, but
suffers a performance penalty when performing write I/Os. As the disk
array begins to fill up, less frequently updated data is moved to RAID 5
space.
Read Verify
A diagnostic test that checks the integrity of the disk media by reading
data from random locations on the disk. A Read Verify test is non-
destructive; that is, it will not alter or destroy any of the data on the
disk. The disk undergoing the test remains in use by the disk array
while the test is in progress.
Rebuild
A Rebuild is the process of recovering data that was on a failed disk.
The disk array reconstructs the data that was on the failed disk using
redundant data from the remaining disks. Until a Rebuild is complete,
the disk array is operating in a non-redundant mode, and is vulnerable
to a second disk failure. See also
Auto
Rebuild.
Rebuild Priority
Rebuild Priority sets the priority of a
Rebuild
equal to (high) or lower
than (low) host I/Os. The Rebuild Priority is able to balance the speed
of the
Rebuild
with host system performance.
Recommended Operating Range
The range of temperature, humidity, vibration, shock, and altitude,
recommended for extended periods of operation of a disk array. See
Maximum Environmental Limit
.
Redundancy
See
Data Redundancy
.