Pair status
The pair status is managed by the primary storage system which manages
the P-VOLs.
• The primary storage system is able to change the pair status of the P-VOL
and the S-VOL.
• The secondary storage system can change the pair status of the S-VOLs,
but cannot change the pair status of the P-VOLs. The primary storage
system detects the change of the pair status of S-VOL, and then change
the status of P-VOL.
• The pair status changes as follows:
¢
If the volume is not assigned to the TrueCopy pair, the volume status
is SMPL.
¢
When the initial copy begins to create a pair, the primary storage
system changes the status of both volumes to COPY (volumes to be
copying).
¢
When the initial copy completes, the primary storage system changes
the status of both volumes to PAIR (volumes become a pair).
¢
When user splits the pair from the primary storage system or the
secondary storage system, the status of the P-VOL and the S-VOL are
changed to PSUS (pair suspended-split: split by a command).
¢
The primary storage system cannot keep the synchronization of the P-
VOL and the S-VOL by some reasons, for example errors, the primary
storage system changes the status of the P-VOL and the S-VOL to
PSUE (pair suspended-error: split by an error).
¢
When the user removes the pair from the primary storage system, the
primary storage system changes the status of the P-VOL and the S-
VOL to SMPL.
¢
When the user removes the pair from the secondary storage system,
the secondary storage system changes the status of the S-VOL to
SMPL, and then the primary storage system detects the removal of
the pair at the secondary system (if the path is normal), the primary
storage system changes the status of the P-VOL to PSUS.
1-8
TrueCopy overview
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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