Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

511Glossary
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.
initiating node
The node on which the system administrator is running a utility that requests a change to VxVM
objects. This node initiates a volume reconfiguration.
JBOD
The common name for an unintelligent disk array which may, or may not, support the hot-swapping
of disks. The name is derived from “just a bunch of disks.”
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 to coordinate certain VxVM operations in a cluster. Any
node is capable of being the master node.
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 consists of one plex of the volume with which the mirror is associated.
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, (for example, 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.
node join
The process through which a node joins a cluster and gains access to shared disks.
Non-Persistent FastResync