HP XP7 Continuous Access Synchronous User Guide (TK911-96004)

• 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