HP XP P9500 Storage - Manual (Page 30)

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If a split or suspend operation is in progress when I/O processing on Cnt Ac-S or Cnt Ac-S Z
pairs begins, the split operation on the pairs is given priority. After the pair is split, then the
I/O processing begins.
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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 suspension
You can specify settings for read/write access to the P-VOL/M-VOL and S-VOL/R-VOL in consistency
groups after pairs are suspended. These settings are specified using RAID Manager or Business
Continuity Manager.
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The RAID Manager settings for Cnt Ac-S are optional.
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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 M-VOL Cnt Ac-S P-VOL Setting Interface
Write Read Write Read
N Y N Y Write access prohibited RAID Manager
Y Y Y Y No option selected
N Y N Y Write access prohibited Business Continuity
Manager
Y Y Y Y Write access permitted
Cnt Ac-S Z R-VOL Cnt Ac-S S-VOL Setting Interface
Write Read Write Read
N N N Y Read access permitted RAID Manager
Y Y Y Y Read/Write access permitted
N N N Y No option selected
N N N Y Write access prohibited Business Continuity
Manager
Y Y Y Y Write access permitted
30 Planning for Continuous Access Synchronous