HP StorageWorks XP Remote Web Console Software - Manual (Page 71)

To split an L2 pair, you must first split the L1 pair (L1 status = PSUS). The reverse and quick restore
pairresync operations cannot be used for L2 pairs.
Table 31 (page 71) shows the relationship
between the L1 pair status and the availability of XP Business Copy pair operations on the associated
L2 pairs. (CMD RJT = command rejected.)
Table 31 Relationship between L1 Pair Status and L2 Pair Operations
L2 Pair Operations L1 Pair Status
Pairsplit-S Pairsplit-E Pairresync
1
Pairsplit Paircreate
Yes Yes Yes No (CMD RJT) Yes COPY(PD)
Yes Yes Yes No (CMD RJT) Yes PAIR
Yes Yes Yes No (CMD RJT) Yes COPY(SP)
Yes Yes Yes No (CMD RJT) No (CMD RJT) PSUS(SP)
Yes Yes Yes Yes
2
Yes PSUS
Yes Yes Yes No (CMD RJT) Yes COPY(RS)
Yes Yes Yes No (CMD RJT) Yes COPY(RS-R)
Yes Yes Yes No (CMD RJT) Yes PSUE
1 You can only resynchronize L2 pairs in Normal Copy or Quick Resync mode. Note that you cannot perform backward
resynchronization (that is, Reverse Copy or Quick Restore).
2
To split L2 pairs, you need to change the status of the L1 pair to PSUS at first.
Table 32 (page 71) shows the relationship between the L2 pair status and the availability of pair
operations on the associated L1 pairs. (CMD RJT = command rejected.) If you delete an L1 pair
that contains an L2 pair, the L2 pair becomes the L1 pair.
Table 32 Relationship between L2 Pair Status and L1 Pair Operations
L1 Pair Operations L2 Pair Status
Pairsplit-S Pairsplit-E Pairresync Pairsplit Paircreate
Yes Yes Yes Yes Yes
1, 2
COPY(PD)
Yes Yes Yes Yes Yes
1, 2
PAIR
Yes Yes No (CMD RJT) No (CMD RJT)
2
No (CMD RJT)
2
COPY(SP)
Yes Yes No (CMD RJT) No (CMD RJT)
2
No (CMD RJT)
2
PSUS(SP)
Yes Yes Yes Yes Yes 1, 2 PSUS
Yes Yes Yes Yes Yes
1, 2
COPY(RS)
— — — No (CMD RJT) No (CMD RJT)
2
COPY(RS-R)
Yes Yes Yes Yes Yes
1, 2
PSUE
1
MU# of L2 pair must be 1 or 2.
2 Not displayed by Remote Web Console.
The read/write operation to each volume (root, node or leaf volume) from the host is enabled or
disabled depending on the status of L1/L2 pairs.
Table 33 (page 72) indicates the relationship
between read/write operation from the host to the node volume and the status of L1/L2 pairs.
Creating Pairs 71