Compaq ProLiant Cluster HA/F500 for Enterprise Virtual Array Setup and Installation Guide

Glossary
ProLiant Cluster HA/F500 for Enterprise Virtual Array Setup and Installation Guide Glossary-7
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: h-glossary
Codename: 49er Part Number: 268374-002 Last Saved On: 5/28/02 3:10 PM
storage subsystem
The controllers, storage devices, shelves, cables, and power supplies used to form a mass
storage subsystem.
system
A complete computer system capable of operating independently.
VCS
Virtual Controller Software. The HSV110 controllers use VCS software.
virtual disk
A simulated disk drive created by the controllers as storage for one or more hosts. The host
computer sees the virtual disk as “real,” with the characteristics of an identical physical disk.
See also logical unit (LUN).
Vraid0
A virtualization technique that provides no data protection. Reading and writing to a
Vraid0 virtual disk is very fast and makes the fullest use of the available storage.
Vraid1
A virtualization technique that provides the highest level of data protection. All data blocks
are mirrored on separate physical disks. Mirroring takes the most storage space.
Vraid5
A virtualization technique that uses parity striping to provide moderate data protection. Parity
is a data protection mechanism for a striped virtual disk. A striped virtual disk has data
divided into chunks and distributed on the physical disks comprising the disk group in which
the virtual disk was created. If the striped virtual disk has parity, another chunk (a parity
chunk) is calculated from the set of data chunks and written to the physical disks. If one of
the data chunks becomes corrupted, the data can be reconstructed from the parity chunk and
the remaining data chunks.
WWN
World Wide Name. A unique Fibre Channel identifier consisting of a 16-character
hexadecimal number. A WWN is required for each Fibre Channel communication port.