HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

Glossary
330 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
PVA module
Power Verification and Addressing module.
RAID
Redundant array of independent disks. Represents multiple levels of storage access
developed to improve performance or availability or both.
RAID level 0
A RAID storageset that stripes data across an array of disk drives. A single logical disk
spans multiple physical disks, allowing parallel data processing for increased I/O
performance. While the performance characteristics of RAID level 0 is excellent, this RAID
level is the only one that does not provide redundancy. Raid level 0 storagesets are referred
to as stripesets.
RAID level 0+1
A RAID storageset that stripes data across an array of disks (RAID level 0) and mirrors the
striped data (RAID level 1) to provide high I/O performance and high availability. Raid
level 0+1 storagesets are referred to as striped mirrorsets.
RAID level 1
A RAID storageset of two or more physical disks that maintains a complete and
independent copy of the entire virtual disk's data. This type of storageset has the advantage
of being highly reliable and extremely tolerant of device failure. Raid level 1 storagesets are
referred to as mirrorsets.
RAID level 3
A RAID storageset that transfers data parallel across the array’s disk drives a byte at a time,
causing individual blocks of data to be spread over several disks serving as one enormous
virtual disk. A separate redundant check disk for the entire array stores parity on a dedicated
disk drive within the storageset. See also RAID level 5.
RAID level 3/5
A specially developed RAID storageset that stripes data and parity across three or more
members in a disk array. A RAIDset combines the best characteristics of RAID level 3 and
RAID level 5. A RAIDset is the best choice for most applications with small to medium I/O
requests, unless the application is write intensive. A RAIDset is sometimes called parity
RAID. Raid level 3/5 storagesets are referred to as RAIDsets.
RAID level 5
A RAID storageset that, unlike RAID level 3, stores the parity information across all of the
disk drives within the storageset. See also RAID level 3.
RAIDset
See RAID level 3/5