HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary

294 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide

PVA module

Power verification and addressing module.

quiesce

The act of rendering bus activity inactive or dormant. For example, quiescing the SCSI bus

operations during a device warm swap.

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

sometimes 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 sometimes 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 all virtual disk data. This type of storageset has the advantage of being

highly reliable and extremely tolerant of device failure. RAID level 1 storagesets are

sometimes referred to as mirrorsets.

RAID level 3

A RAID storageset that transfers data parallel across the array 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.