HP XP Business Copy Software - Manual (Page 41)

5. When you start a pairresync operation, the pair status changes to COPY(RS) or COPY(RS-R).
When the pairresync operation is complete, the pair status changes to PAIR.
Table 12 BC pair status conditions
S-VOL Access Description Pair
Status
N/A (there is no
S-VOL yet). The volume is not assigned to a BC pair. The disk array accepts read
and write I/Os for all SMPL volumes that are not reserved.
SMPL
Read only.
The initial copy operation is in progress. The disk array continues to
accept read and write operations for the P-VOL, but stops accepting
write operations for the S-VOL. No update copy operations are per-
formed.
COPY(PD)
Read only.
The initial copy operation is complete, and the disk array performs
asynchronous update copy operations from the P-VOL to the S-VOL as
needed. The P-VOL and S-VOL of a duplex pair (PAIR status) may not
be identical. The disk array rejects all write I/Os for S-VOLs with status
PAIR.
PAIR
Read only.
The status becomes COPY(SP) when the steady split mode is selected
for the pairsplit operation. All P-VOL updates prior to the pairsplit
command are copied to the S-VOL. When these updates are complete,
the split S-VOL is identical to the state of the P-VOL when the split star-
ted. The disk array rejects all write I/Os for COPY(SP) S-VOLs.
COPY(SP)
Read and write.
The S-VOL can be
mounted.
The status becomes PSUS(SP) when the quick split mode is selected for
the pairsplit operation. Only the P-VOL differential data is copied to
the S-VOL in the background. The disk array accepts writes for PSUS(SP)
S-VOLs. PSUS(SP) pairs cannot be deleted.
PSUS(SP)
Read and write.
The S-VOL can be
mounted.
The disk array stops update copy operations for PSUS (split) pairs, and
starts accepting write I/Os for PSUS S-VOLs. The disk array keeps track
of all updates to the split P-VOL and S-VOL, so the pair can be resyn-
chronized quickly.
PSUS
Read only.
The disk array does not accept write I/Os for COPY(RS) S-VOLs. When
a split pair is resynchronized in normal mode, the disk array copies
only the P-VOL differential data to the S-VOL. When a PSUE (suspended)
pair is resynchronized, the disk array copies the entire P-VOL to the S-
VOL. No update copy operations are performed during the pairresync
operation.
COPY(RS)
Read only.
The disk array does not accept write I/Os for COPY(RS-R) S-VOLs.
When a split pair is resynchronized in reverse or quick restore mode,
the disk array copies only the S-VOL differential data to the P-VOL. No
update copy operations are performed during the reverse or quick re-
store pairresync operation.
COPY(RS-
R)
Read only.
The disk array continues accepting read and write I/Os for a PSUE
(suspended) P-VOL, but does not perform update copy operations for
a PSUE S-VOL. The disk array marks the entire P-VOL track map as
difference data, so the entire P-VOL is copied to the S-VOL when the
PSUE pair is resumed. Use the pairresync command to resume a PSUE
pair.
PSUE
XP Business Copy User Guide 41