HP StorageWorks XP Remote Web Console Software - Manual (Page 43)

Figure 17 Pair Status Transitions
1.
If a volume is not assigned to a Siz pair (Siz pair), its status is simplex.
2. Select the simplex volumes for S-VOL and T-VOL to create a Siz pair. When you create a Siz
pair, the initial copy operation starts. During the initial copy operation, the status of the S-VOL
and T-VOL changes to pending.
3. When the initial copy operation is complete, the pair status becomes duplex. When the
initial copy is completed, the differential data between the S-VOL and the T-VOL is copied
by the update copy.
4. There are two kinds of pair status (split and suspend) when the pair is not synchronized:
• When you split a pair (pairsplit), the pair status changes to split. During the pairsplit process,
the pair status becomes SP-pending. If you specify Quick Split pairsplit, the pair status
becomes V-Split during the process. When the split is complete, the pair status changes
to split, and you can access the split T-VOL. The update copy operation is not performed
on pairs where the status is split.
• If the storage system cannot maintain duplex status for any reason, or if you suspend the
pair, the pair status changes to suspend.
5. When you start a pairresync operation, the pair status changes to resync or resync-r. When the
pairresync operation is complete, the pair status changes to PAIR.
Hitachi ShadowImage for z/OS user guide 43