VERITAS Volume Manager 3.1 Administrator's Guide

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Glossary
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. See “path”, “primary
path”, “secondary path”.
associate The process of
establishing a relationship
between Volume Manager 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 Aplexassociated
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.
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 a disk or array.
boot disk A disk used for booting
purposes.
clean node shutdown The
ability of a node to leave the
cluster gracefully when all access
to shared volumes has ceased.
cluster A set of hosts 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