Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

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 is not supported on the HP-UX platform.
enclosure See disk enclosure.
enclosure-based naming See device name.
fabric mode disk A disk device that is accessible on a Storage Area Network (SAN) via a 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.
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 host ID 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.
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 (just a bunch of
disks)
The common name for an unintelligent disk array which may, or may not, support
the hot-swapping 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.
Glossary564