HP StorageWorks XP Remote Web Console Software - Manual (Page 31)

ShadowImage for z/OS user guide 31
XP128/XP1024/XP10000/XP12000. Figure 9 illustrates the pair status transitions and the relationship
between the pair status and the SI390 operations.
Figure 9 ShadowImage pair status transitions
1. If a volume is not assigned to a ShadowImage for z/OS (SIz) pair, its status is simplex.
2. Select the simplex volumes for S-VOL and T-VOL to create an SIz pair. When you create an 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 will be 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. Note that 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 the pairs with split
status.
• If the XP128/XP1024/XP10000/XP12000 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.