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

Chapter 8, Administering Volumes
Monitoring and Controlling Tasks
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Volume Kernel States
The volume kernel state indicates the accessibility of the volume. The volume kernel state
allows a volume to have an offline (DISABLED), maintenance (DETACHED), or online
(ENABLED) mode of operation.
Note No user intervention is required to set these states; they are maintained internally.
On a system that is operating properly, all volumes are ENABLED.
The following volume kernel states are defined:
DETACHED Volume Kernel State
Maintenance is being performed on the volume. The volume cannot be read from or
written to, but certain plex operations and ioctl function calls are accepted.
DISABLED Volume Kernel State
The volume is offline and cannot be accessed.
ENABLED Volume Kernel State
The volume is online and can be read from or written to.
Monitoring and Controlling Tasks
Note VxVM supports this feature for private disk groups, but not for shareable disk
groups in a cluster environment.
The VxVM task monitor tracks the progress of system recovery by monitoring task
creation, maintenance, and completion. The task monitor allows you to monitor task
progress and to modify characteristics of tasks, such as pausing and recovery rate (for
example, to reduce the impact on system performance).
Specifying Task Tags
Every task is given a unique task identifier. This is a numeric identifier for the task that can
be specified to the vxtask utility to specifically identify a single task. Several VxVM
utilities also provide a -t option to specify an alphanumeric tag of up to 16 characters in
length. This allows you to group several tasks by associating them with the same tag.