HP XP Cluster Extension Software Installation Guide

quorum In MSFC, a cluster resource that has been configured to control the cluster, maintaining essential
cluster data and recovery information. In the event of a node failure, the quorum acts as a
tie-breaker and is transferred to a surviving node to ensure that data remains consistent within
the cluster.
RAID Redundant array of independent disks.
rolling disaster A rolling disaster is a catastrophic event or outage that affects the data stored on remote mirrored
disk pairs. In a rolling disaster, data stored on remote mirrored disk pairs can be entirely lost
during a recovery attempt.
S-VOL Secondary or remote volume. The copy volume that receives the data from the primary volume.
SCSI Small Computer Systems Interface. A standard, intelligent parallel interface for attaching peripheral
devices to computers, based on a device-independent protocol.
SDK Software Developer Kit.
secondary site The data center location with the mirror copy of the quorum disk pair.
SMIT System Manager Information Tool.
split-brain
syndrome
A state of data corruption that can occur if a cluster is re-formed as subclusters of nodes at each
site, and each subcluster assumes authority, starting the same set of applications and modifying
the same data.
SPOCK Single Point of Connectivity Knowledge website. SPOCK is the primary portal used to obtain
detailed information about supported HP storage product configurations.
SPOF Single point of failure.
SUM Software Update Manager.
SVP Service processor. A computer built into a disk array. The SVP, used only by an HP service
representative, provides a direct interface to the disk array.
UCF User configuration file.
VCS VERITAS Cluster Server.
volume On the XP array, a volume is a uniquely identified virtual storage device composed of a control
unit (CU) component and a logical device (LDEV) component separated by a colon. For example
00:00 and 01:00 are two uniquely identified volumes; one is identified as CU = 00 and LDEV
= 00, and the other as CU = 01 and LDEV = 00; they are two unique separate virtual storage
devices within the array.
VSC Volume size customization. Also known as CVS.
VxVM Veritas Volume Manager.
WMI service The Windows Management Instrumentation service.
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