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Table 10 Relationship between L2 pair status and L1 pair operations
L1 Pair Operations
L2 Pair
Status
Paircreate
Pairsplit
Pairresync
Reverse/
Quick
Restore
Pairsplit-E Pairsplit-S
COPY(PD) OK
1, 2
OK OK OK OK OK
PAIR
OK
1, 2
OK OK OK OK OK
COPY(SP)
NO
2
(CMD RJT)
NO
2
(CMD RJT)
NO
(CMD RJT)
NO
(CMD RJT)
OK OK
PSUS(SP)
NO
2
(CMD RJT)
NO
2
(CMD RJT)
NO
(CMD RJT)
NO
(CMD RJT)
OK OK
PSUS OK
1, 2
OK OK OK OK OK
COPY(RS) OK
1, 2
OK OK OK OK OK
COPY(RS-R)
NO
2
(CMD RJT)
NO
2
(CMD RJT)
————
PSUE OK
1, 2
OK OK OK OK OK
1
MU#ofL2nodepairmembermustbe1or2.
2
Not displayed by the array management interface.
The read/write operation to each volume (root, node, or leaf) from the host is enabled or disabled
depending on the status of L1/L2 pairs. The read/write operation from the host can always be
performed to the root volume regardless of the status of L1/L2 pairs. Table 11 shows the relationship
between read/write operations from host to node volume and status of L1/L2 pairs. Table 12 shows the
relationship between read/write operations from host to leaf volume and L2 pair status.
Table 11 Read/write operation (host to the node volume) and L1/L2 pair status
L2 Pair Status
L1 Pair
Status
COPY(PD)
PAIR
COPY(SP)
PSUS(SP)/
PSUS
COPY(RS) PSUE
COPY(PD)
Read Only Read Only Read Only Read Only Read Only Read Only
PAIR
Read Only Read Only Read Only Read Only Read Only Read Only
COPY(SP)
Read Only Read Only Read Only Read Only Read Only Read Only
PSUS(SP)/
PSUS
Read/ Write Read/ Write Read/ Write Read/ Write Read/ Write Read/ Write
COPY(RS)
Read Only Read Only Read Only Read Only Read Only Read Only
COPY(RS-R)
Read Only Read Only Read Only Read Only Read Only Read Only
PSUE
Read Only Read Only Read Only Read Only Read Only Read Only
Table 12 indicates the relationship between the read/write operation from the host to the leaf volume
and the L2 pair status.
Business Copy XP user guide
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