HP Surestore Disk Array 12h - And FC60 Service Manual page 267

RAID
RAID 0/1
RAID 5
Read Verify
Rebuild
Rebuild Priority
Recommended Operating Range The range of temperature, humidity, vibration, shock, and altitude,
Redundancy
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 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.
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.
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.
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 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 for extended periods of operation of a disk array. See
Maximum Environmental Limit.
See Data Redundancy.
Glossary
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