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227Creating and administering plexes
Displaying plex information
SNAPTMP plex state
The SNAPTMP plex state is used during a vxassist snapstart operation when a
snapshot is being prepared on a volume.
STALE plex state
If there is a possibility that a plex does not have the complete and current
volume contents, that plex is placed in the STALE state. Also, if an I/O error
occurs on a plex, the kernel stops using and updating the contents of that plex,
and the plex state is set to STALE.
A vxplex att operation recovers the contents of a STALE plex from an ACTIVE
plex. Atomic copy operations copy the contents of the volume to the STALE
plexes. The system administrator can force a plex to the STALE state with a
vxplex det operation.
TEMP plex state
Setting a plex to the TEMP state eases some plex operations that cannot occur in
a truly atomic fashion. For example, attaching a plex to an enabled volume
requires copying volume contents to the plex before it can be considered fully
attached.
A utility sets the plex state to TEMP at the start of such an operation and to an
appropriate state at the end of the operation. If the system fails for any reason, a
TEMP plex state indicates that the operation is incomplete. A later vxvol
start dissociates plexes in the TEMP state.
TEMPRM plex state
A TEMPRM plex state is similar to a TEMP state except that at the completion of
the operation, the TEMPRM plex is removed. Some subdisk operations require a
temporary plex. Associating a subdisk with a plex, for example, requires
updating the subdisk with the volume contents before actually associating the
subdisk. This update requires associating the subdisk with a temporary plex,
marked TEMPRM, until the operation completes and removes the TEMPRM
plex.
If the system fails for any reason, the TEMPRM state indicates that the
operation did not complete successfully. A later operation dissociates and
removes TEMPRM plexes.