HP XP Continuous Access Software - Manual (Page 42)

Pair status Description Primary
data volume
access
Secondary
data volume
access
Deleting Pair is not synchronized and is in transition
from PAIR, COPY, or PSUS/PSUE to SMPL.
When the pairsplit-S operation is requested,
the status of all affected pairs changes to
Deleting. When the pairsplit-S operation is
complete, the status changes to SMPL.
Read / Write Read Only
HOLD Contingency pair is prepared for a delta
resync operation. When the primary data
volume's status is HOLD, write data for the
Continuous Access XP Synchronous S-VOL is
stored in the master journal volume.
Only the delta resync, delete, and change
pair operations are allowed on contingency
pairs in HOLD status.
Read / Write 2 Read / Write 3
HLDE An error occurred on a contingency pair
in HOLD status. When the primary data
volume's status is HLDE, the write data for
the Continuous Access XP Synchronous
S-VOL is not being stored in the master
journal volume.
Only the recover pair status to standby
(HOLD), delete, and change pair operations
are allowed on contingency pairs in HLDE
status.
Read / Write 2
—
1 RAID Manager XP displays the PFUL status. Command View XP 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 Continuous Access XP
Synchronous pair that shares the volume.
3 The secondary data volume of a Continuous Access XP 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.
Continuous Access XP Journal split types (PSUS)
Table 5 describes Continuous Access XP Journal split types. You can split a Continuous Access XP
Journal pair any time after the initial copy operation completes. You must split a Continuous Access XP
Journal pair to perform media maintenance on the primary data volume or access the secondary data
volume (secondary data volume write enable).
When splitting a Continuous Access XP 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 Continuous Access XP 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) Continuous Access XP 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 5 describes consistency statuses for split or suspended
Continuous Access XP Journal secondary data volumes (the consistency status is displayed only at
the secondary array).
42 Overview of Continuous Access XP Journal