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Table 13 BC pair status conditions
Pair Status Description S-VOL Access
SMPL
The volume is no
t assigned to a BC pair. The disk array accepts
read and write I/Os for all SMPL volumes that are not reserved.
N/A (there is no
S-VOL yet).
COPY(PD)
Theinitialcopyoperationisinprogress. Thediskarray
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 performed.
Read only.
PAIR
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.
Read only.
COPY(SP)
The status
becomes COPY(SP) when the steady split mode is
selected f
or the pairsplit operation. All P-VOL updates prior to
the pairsp
lit command are copied to the S-VOL. When these
updates a
re complete, the split S-VOL is identical to the state of
the P-VOL
when the split started. The disk array rejects all write
I/Os for C
OPY(SP) S-VOLs.
Read only.
PSUS(SP)
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.
Read and write.
The S-VOL can be
mounted.
PSUS
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 resynchronized quickly.
Read and write.
The S-VOL can be
mounted.
COPY(
RS)
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.
Read o
nly.
COPY(RS-R)
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 restore pairresync operation.
Read only.
PSUE
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-VOLtrackmapasdifferencedata,sotheentireP-VOLis
copied to the S-VOL when the PSUE pair is resumed. Use the
pairresync command to resume a PSUE pair.
Read only.
Cautions on switching off the power supply
To switch off the power supply of the disk array during BC operations, make sure to:
• Complete copying for the BC pair in COPY(SP) or PSUS(SP) status first to change the pair status
from COPY(SP) or PSUS(SP) to PSUS, and then switch off the power supply. If shared memory
is volatilized when you switch on the power supply again, the pair in COPY(SP) or PSUS(SP)
status changes to PSUE.
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Business Copy XP (BC) for the Array