VERITAS Enterprise Administrator UserÆs Guide 5.0 (September 2006)

46 Glossary
cluster
A set of host machines (nodes) that shares a set of disks.
cluster file system
See CFS.
command log
A log file that contains a history of Veritas Volume Manager (VxVM) tasks performed in the current
session and previous sessions. Each task is listed with the task originator, the start/finish times, the
task status, and the low-level commands used to perform the task.
DCO Data Change Object
See DCO.
DCO
A Volume Manager object that keeps the Persistent FastResync tracking information
DDI
DDI properties are device driver properties primarily used in Solaris OS.
DDL
Device Discovery Layer. A facility of VxVM for discovering disk attributes needed for VxVM DMP
operation.
Device Discovery Layer
See DDL.
Dirty Region Logging
See DRL.
device name
The physical disk device name (or disk access name).
dialog box
A window in which the user submits information to VxVM. Dialog boxes can contain selectable
buttons and/or fields that accept information.
disk group
A set of disks that are under VxVM control and share a common configuration. A disk group
configuration is a set of records containing detailed information on existing Veritas Volume Manager
objects (such as disk and volume attributes) and their relationships. Each disk group has an
administrator-assigned name. Volumes can only be created on disks that belong to disk groups.
disk name
The Veritas Volume Manager disk name (or disk media name). This is the logical name given to the
disk by VxVM or the administrator.
DMP
The Veritas Volume Manager Dynamic Multipathing facility.
dock
To separate or attach the main window and a subwindow.