VERITAS Volume Manager 4.1 Administrator's Guide

Glossary
disk media record
Glossary432
disk media record A configuration record
that identifies a particular disk, by disk ID,
and gives that disk a logical (or
administrative) name.
disk name A logical or administrative name
chosen for a disk that is under the control of
VxVM, such as disk03. The term disk media
name is also used to refer to a disk name.
dissociate The process by which any link
that exists between two VxVM objects is
removed. For example, dissociating a
subdisk from a plex removes the subdisk
from the plex and adds the subdisk to the
free space pool.
dissociated plex A plex dissociated from a
volume.
dissociated subdisk A subdisk dissociated
from a plex.
distributed lock manager A lock manager
that runs on different systems in a cluster,
and ensures consistent access to distributed
resources.
enabled path A path to a disk that is
available for I/O.
encapsulation A process that converts
existing partitions on a specified disk to
volumes. Encapsulation does not apply to
HP-UX.
enclosure See disk enclosure.
enclosure-based naming See device
name.
fabric mode disk A disk device that is
accessible on a <Z_Hyperlink>Storage Area
Network (SAN) via a <Z_Hyperlink>Fibre
Channel switch.
FastResync A fast resynchronization
feature that is used to perform quick and
efficient resynchronization of stale mirrors,
and to increase the efficiency of the snapshot
mechanism. Also see Persistent FastResync
and Non-Persistent FastResync.
Fibre Channel A collective name for the
fiber optic technology that is commonly used
to set up a Storage Area Network (SAN).
file system A collection of files organized
together into a structure. The UNIX file
system is a hierarchical structure consisting
of directories and files.
free space An area of a disk under VxVM
control that is not allocated to any subdisk or
reserved for use by any other VxVM object.
free subdisk A subdisk that is not
associated with any plex and has an empty
putil[0] field.
hostid A string that identifies a host to
VxVM. 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.
hot-swap Refers to devices that can be
removed from, or inserted into, a system
without first turning off the power supply to
the system.