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• If a split operation is in progress when I/O processing on the pairs begins, the split operation

on the pairs is given priority. After the pair is split, then the I/O processing begins.

• Data consistency cannot be ensured when all of the following conditions exist:

- A port is blocked.

- A split command is in progress.

- I/O processing begins.

In such a case, resynchronize the consistency group and then run the split command again.

Host access after split

You can specify settings for read/write access to the P-VOL/P-VOL and S-VOL/S-VOL in consistency

groups after pairs are split. These settings are specified using RAID Manager or Business Continuity

Manager.

• The RAID Manager settings for Cnt Ac-S are optional.

• The Business Continuity Manager settings for Cnt Ac-S Z are required.

The following tables show the effects of the settings on read and write access.

Cnt Ac-S Z P-VOLCnt Ac-S P-VOLSettingInterface

WriteReadWriteRead

NYNYWrite access prohibitedRAID Manager

YYYYNo option selected

NYNYWrite access prohibitedBusiness Continuity

Manager

YYYYWrite access permitted

Cnt Ac-S Z S-VOLCnt Ac-S S-VOLSettingInterface

WriteReadWriteRead

NNNYRead access permittedRAID Manager

YYYYRead/Write access permitted

NNNYNo option selected

NNNYWrite access prohibitedBusiness Continuity

Manager

YYYYWrite access permitted

Consistency group planning 29

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