The number of bitmap areas affects the maximum possible number of pairs that can be created in
the storage system.
Pair status
Every pair operation results in a change in pair status. You should monitor pair status to insure
that an operation completed successfully. Also, pairs must have a specific status in order for specific
operations to be executed.
The following provides a brief description of the pair statuses. For complete details, see “Pair status
definitions” (page 67) .
• SMPL: A volume that is not assigned to a pair is in Simplex status, SMPL.
• COPY: When copy processing is started, the primary system changes the status of the P-VOL
and S-VOL to COPY.
• PAIR: When the initial copy processing is complete, the primary system changes the status of
both data volumes to PAIR.
• PSUE: When a pair is suspended due to an error condition, the primary system changes the
P-VOL and S-VOL status to PSUE (if the path status is normal).
• PSUS:
◦ When a pair is split by the user (pairsplit-r), the primary or secondary system changes
the status of the P-VOL and S-VOL to PSUS (if the path status is normal).
◦ If a pair is split from the secondary system, it changes the S-VOL status to PSUS. The
primary system detects the split (if path status is normal) and changes the P-VOL status to
PSUS.
16 Continuous Access Journal overview
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