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

Table 9-1
Volume states (continued)
DescriptionVolume state
The volume is either in read-writeback recovery mode (the kernel
state is ENABLED) or was in read-writeback mode when the machine
was rebooted (the kernel state is DISABLED). With read-writeback
recovery, plex consistency is recovered by reading data from blocks
of one plex and writing the data to all other writable plexes. If the
volume is ENABLED, the plexes are being resynchronized through the
read-writeback recovery. If the volume is DISABLED, the plexes were
being resynchronized through read-writeback when the machine
rebooted and still need to be synchronized.
For a RAID-5 volume, the volume is either undergoing a parity
resynchronization (the kernel state is ENABLED) or was having its
parity resynchronized when the machine was rebooted (the kernel
state is DISABLED).
SYNC
The interpretation of these states during volume startup is modified by the
persistent state log for the volume (for example, the DIRTY/CLEAN flag). If the
clean flag is set, an ACTIVE volume was not written to by any processes or was
not even open at the time of the reboot; therefore, it can be considered CLEAN.
In any case, the clean flag is always set when the volume is marked CLEAN.
Volume kernel states
The volume kernel state indicates the accessibility of the volume. The volume
kernel state lets a volume have an offline (DISABLED), maintenance (DETACHED),
or online (ENABLED) mode of operation.
You do not set these states; they are maintained internally. On a system that is
operating properly, all volumes are ENABLED.
Table 9-2 shows the volume kernel states that can be defined.
Table 9-2
Volume kernel state
DescriptionVolume 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.
DETACHED
The volume is offline and cannot be accessed.DISABLED
The volume is online and can be read from or written to.ENABLED
339Administering volumes
Displaying volume information