Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

258 Administering volumes
Displaying volume information
REPLAY volume state
The volume is in a transient state as part of a log replay. A log replay occurs when it
becomes necessary to use logged parity and data. This state is only applied to RAID-5
volumes.
SYNC volume state
The volume is either in read-writeback recovery mode (kernel state is currently
ENABLED) or was in read-writeback mode when the machine was rebooted (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, this means that the plexes are being resynchronized through the
read-writeback recovery. If the volume is DISABLED, it means that the plexes were being
resynchronized through read-writeback when the machine rebooted and therefore still
need to be synchronized.
For a RAID-5 volume, the volume is either undergoing a parity resynchronization (kernel
state is currently ENABLED) or was having its parity resynchronized when the machine
was rebooted (kernel state is DISABLED).
Note: The interpretation of these flags 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. The clean flag is always set in any
case where the volume is marked CLEAN.
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.