Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Active/Active disk
arrays
This type of multipathed disk array allows you to access a disk in the disk array
through all the paths to the disk simultaneously, without any performance
degradation.
Active/Passive disk
arrays
This type of multipathed disk array allows one path to a disk to be designated as
primary and used to access the disk at any time. Using a path other than the
designated active path results in severe performance degradation in some disk
arrays.
associate The process of establishing a relationship between VxVM objects; for example, a
subdisk that has been created and defined as having a starting point within a plex
is referred to as being associated with that plex.
associated plex A plex associated with a volume.
associated subdisk A subdisk associated with a plex.
atomic operation An operation that either succeeds completely or fails and leaves everything as it
was before the operation was started. If the operation succeeds, all aspects of the
operation take effect at once and the intermediate states of change are invisible.
If any aspect of the operation fails, then the operation aborts without leaving
partial changes.
In a cluster, an atomic operation takes place either on all nodes or not at all.
attached A state in which a VxVM object is both associated with another object and enabled
for use.
block The minimum unit of data transfer to or from a disk or array.
boot disk A disk that is used for the purpose of booting a system.
boot disk group A private disk group that contains the disks from which the system may be booted.
bootdg A reserved disk group name that is an alias for the name of the boot disk group.
clean node shutdown The ability of a node to leave a cluster gracefully when all access to shared volumes
has ceased.
cluster A set of hosts (each termed a node) that share a set of disks.
cluster manager An externally-provided daemon that runs on each node in a cluster. The cluster
managers on each node communicate with each other and inform VxVM of changes
in cluster membership.
Glossary