HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Maintenance and Service Guide (EK-G80MS-SA. C01, March 2005)

Glossary
272 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
RAID-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-0 is excellent, this RAID level is the only one that
does not provide redundancy. RAID-0 storagesets are sometimes referred to as stripesets.
RAID 0+1
A RAID storageset that stripes data across an array of disks (RAID-0) and mirrors the striped
data (RAID-1) to provide high I/O performance and high availability. RAID 0+1 storagesets are
sometimes referred to as striped mirrorsets.
RAID-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-1 storagesets are sometimes referred to
as mirrorsets.
RAID-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-5.
RAID 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-3 and RAID-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 3/5
storagesets are sometimes referred to as RAIDsets.
RAID-5
A RAID storageset that, unlike RAID-3, stores the parity information across all of the disk
drives within the storageset. See also RAID-3.
RAIDset
See RAID 3/5.
reconstruction
The process of regenerating the contents of a failed member’s data. The reconstruct process
writes the data to a spareset disk and then incorporates the spareset disk into the mirrorset,
striped mirrorset, or RAIDset from which the failed member came. See also regeneration.