Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Glossary 461
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.