VERITAS Volume Manager 3.1 Administrator's Guide

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hostid A string that identifies a
host to the Volume Manager. The
hostid for a host is stored in its
volboot file, and is used in
defining ownership of disks and
disk groups.
hot-relocation A technique of
automatically restoring
redundancy and access to mirrored
and RAID-5 volumes when a disk
fails. This is done by relocating the
affected subdisks to disks
designated as spares and/or free
space in the same disk group.
initiating node The node on
which the system administrator is
running a utility that requests a
changeto Volume Manager objects.
This node initiates a volume
reconfiguration.
log plex A plex used to store a
RAID-5 log. The term log plex
may also be used to refer to a Dirty
Region Logging plex.
log subdisk A subdisk that is
used to store a dirty region log.
master node A node that is
designated by the software as the
“master” node. Any nodeis capable
of being the master node. The
master node coordinates certain
Volume Manager operations.
mastering node The node to
which a disk is attached. This is
also known as a disk owner.
mirror A duplicate copy of a
volume and the data therein (in
the form of an ordered collection of
subdisks). Each mirror is one copy
of the volume with which the
mirror is associated. The terms
mirror and plex can be used
synonymously.
mirroring A layout technique
that mirrors the contents of a
volume onto multiple plexes. Each
plex duplicates the data stored on
the volume, but the plexes
themselves may have different
layouts.
multipathing Where there are
multiple physical access paths to a
disk connected to a system, the
disk is called multipathed. Any
software residing on the host, (e.g.,
the DMP driver) that hides this
fact from the user is said to provide
multipathing functionality.
node One of the hosts in a cluster.
node abort A situation where a
node leaves a cluster (on an
emergency basis) without
attempting to stop ongoing
operations.