Figure 9 shadowimage pair status transitions, 9 shadowimage pair status transitions – HP XP Business Copy Software User Manual

Page 34

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ShadowImage for the XP1024/XP128/XP12000/XP10000/SVS 200

XP1024/XP128/XP12000/XP10000/SVS 200.

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 XP1024/XP128/XP12000/XP10000/SVS 200 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.

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