HP XP Continuous Access Software - Manual (Page 36)

1 XP RAID Manager displays the PFUL status. XP Command View Advanced Edition Software or XP Remote
Web Console displays this status as PAIR.
2 Whether you can or cannot access the primary data volume depends on the status of the XP Continuous
Access Synchronous pair that shares the volume.
3 The secondary data volume of an XP Continuous Access Journal pair in HOLD status uses two mirrors.
Whether you can or cannot access the secondary data volume depends on the status of the mirror whose
status is not HOLD.
XP Continuous Access Journal split types (PSUS)
Table 4 (page 36) describes XP Continuous Access Journal split types. You can split an XP
Continuous Access Journal pair any time after the initial copy operation completes. You must split
an XP Continuous Access Journal pair to perform media maintenance on the primary data volume
or access the secondary data volume (secondary data volume write enable).
When splitting an XP Continuous Access Journal pair, the primary and secondary arrays ensure
synchronization by completing or discarding pending update copy operations according to the
user-specified pending update option (purge/flush). The primary and secondary arrays keep track
of journal data discarded tracks during the pairsplit operation. After the pair status changes to
PSUS, the primary array stops performing journal obtain operations for the pair, continues accepting
write I/Os for the split XP Continuous Access Journal primary data volume, and keeps track of
primary data volume tracks updated while the pair status is split. If you enabled the secondary
data volume's write option when splitting the pair, the secondary array keeps track of the secondary
volume tracks which are changed while the pair is split. When the pair is resumed (pairresync),
the secondary array sends the secondary data volume's track bitmap to the primary array, and
the primary array merges the primary and secondary data volume bitmaps to determine which
tracks are out-of-sync.
A split (or suspended) XP Continuous Access Journal secondary data volume has an additional
status called the consistency status. The consistency status is displayed only at the secondary array
and indicates the update sequence consistency of the secondary data volume with respect to the
other secondary data volume in the same group.
Table 4 (page 36) describes consistency statuses
for split or suspended XP Continuous Access Journal secondary data volumes (the consistency status
is displayed only at the secondary array).
Table 4 XP Continuous Access Journal split types (PSUS)
Description Applies to Type
The secondary data volume's split type
is PSUS-by MCU. Primary data volume PSUS, P-VOL by Operator
You split the pair from the primary or
secondary array using the secondary
data volume option. Primary data volume, Secondary data
volume PSUS, S-VOL by Operator
The secondary array received a request
from the primary array to split the pair.
The primary data volume's split type is
PSUS-P-VOL by Operator or PSUS-S-VOL
by Operator. Secondary data volume PSUS, by MCU
The primary array detected an error
condition at the secondary array that
caused the primary array to suspend
the XP Continuous Access Journal data
volume pair. The secondary data
volume suspend type is PSUE-S-VOL
Failure. Primary data volume, Secondary data
volume PSUS, by RCU
36 Overview of XP Continuous Access Journal