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266 Administering volumes
Displaying volume information
INVALID volume state
The contents of an instant snapshot volume no longer represent a true point-in-
time image of the original volume.
NEEDSYNC volume state
The volume requires a resynchronization operation the next time it is started.
For a RAID-5 volume, a parity resynchronization operation is required.
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.