HP ProLiant 4500 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator Gui - Page 175

Quorum disk, RA4000, Redundant Array, of Inexpensive, Disks, RAID 0, Redundancy, Reliability, Rescan

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Glossary-5 Quorum disk RA4000 RAID Redundant Array of Inexpensive Disks A device managed by Microsoft Cluster Server (MSCS) that provides a means for persistent storage of the cluster configuration information required for failover and failback events as well as for arbitrating ownership of cluster resources. See Compaq StorageWorks RAID Array 4000 See Redundant Array of Inexpensive Disks A method of using hard disk drives in an array to provide data redundancy to increase system reliability and performance. RAID is classified in the following levels: Redundancy Reliability Rescan RAID 0 Data striping. This RAID level stripes data across all drives of the array, but does not incorporate a method to create redundant data. RAID 0 does not provide fault tolerance. RAID 1 Drive mirroring. This level creates fault tolerance by storing two sets of duplicate data on a pair of disk drives. RAID 4 Data guarding. This level involves the use of a single, designated drive containing parity data. If a drive fails, the controller uses the data on the parity drive and the remaining drives to reconstruct data from the failed drive. RAID 5 Distributed data guarding. This level stores parity data across all the drives in the array. Spreading the parity across all the drives allows more simultaneous read operations and higher performance than data guarding (RAID 4). The provision of multiple, interchangeable components to perform a single function in order to cope with failures and errors. A RAID set is considered to be redundant when user data is recorded directly to one member and all of the other members include associated parity information. The continuous integrity of a system (server, storage, network, or cluster). The ability to check for new or lost logical disks or an array controller on the loop.

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Glossary
-5
Quorum disk
A device managed by Microsoft Cluster Server
(MSCS) that provides a means for persistent storage
of the cluster configuration information required for
failover and failback events as well as for arbitrating
ownership of cluster resources.
RA4000
See
Compaq StorageWorks RAID Array 4000
RAID
See
Redundant Array of Inexpensive Disks
Redundant Array
of Inexpensive
Disks
A method of using hard disk drives in an array to
provide data redundancy to increase system reliability
and performance. RAID is classified in the following
levels:
RAID 0
Data striping. This RAID level stripes data
across all drives of the array, but does not
incorporate a method to create redundant data.
RAID 0 does not provide fault tolerance.
RAID 1
Drive mirroring. This level creates fault
tolerance by storing two sets of duplicate data
on a pair of disk drives.
RAID 4
Data guarding. This level involves the use of a
single, designated drive containing parity data.
If a drive fails, the controller uses the data on
the parity drive and the remaining drives to
reconstruct data from the failed drive.
RAID 5
Distributed data guarding. This level stores
parity data across all the drives in the array.
Spreading the parity across all the drives
allows more simultaneous read operations and
higher performance than data guarding
(RAID 4).
Redundancy
The provision of multiple, interchangeable
components to perform a single function in order to
cope with failures and errors. A RAID set is
considered to be redundant when user data is recorded
directly to one member and all of the other members
include associated parity information.
Reliability
The continuous integrity of a system (server, storage,
network, or cluster).
Rescan
The ability to check for new or lost logical disks or an
array controller on the loop.