VERITAS Volume Manager 3.1 Administrator's Guide

Recovery
Plex and Volume States
Chapter 8 359
• OFFLINE
• TEMP
• TEMPRM
• TEMPRMSD
IOFAIL
A Dirty Region Logging or RAID-5 log plex is a special case, as its state is
always set to LOG.
EMPTY Plex State
Volume creation sets all plexes associated with the volume to the
EMPTY state to indicate that the plex is not yet initialized.
CLEAN Plex State
A plex is in a CLEAN state when it is known to contain a consistent copy
(mirror) of the volume contents and an operation has disabled the
volume. As a result, when all plexes of a volume are clean, no action is
required to guarantee that the plexes are identical when that volume is
started.
ACTIVE Plex State
A plex can be in the ACTIVE state in two ways:
• when the volume is started and the plex fully participates in normal
volume I/O (the plex contents change as the contents of the volume
change)
• when the volume is stopped as a result of a system crash and the plex
is ACTIVE at the moment of the crash
In the latter case, a system failure can leave plex contents in an
inconsistent state. When a volume is started, Volume Manager does the
recovery action to guarantee that the contents of the plexes marked as
ACTIVE are made identical.
NOTE On a system running well, ACTIVE should be the most common state
you see for any volume plexes.