HP XP P9500 Storage - Manual (Page 25)

3 HP P9500 software supported for external volumes
You will use HP P9500 software products and functionality to manage and manipulate data in
your mapped volumes: for example, Virtual LVI/Virtual LUN, Continuous Access Synchronous,
LUN Manager, and so on.
This topic provides requirements and restrictions for the HP software supported with external
volumes.
Cache Residency
Review the following when using external volumes with Cache Residency:
•
If you set bind mode, a cache of twice as much capacity as the user data area of the mapped
volume is required for the Cache Residency operation.
•
Bind mode cannot be specified for an external volume if the Cache Mode is set to Disable You
can specify the Cache Mode setting before, during, or after mapping. See
Editing external
volume policies (settings) (page 36) for more information.
Snapshot
Mapped volumes can be used in pairs for Snapshot, with the following restrictions:
•
Both internal and external volumes cannot be used together in the same pool.
•
All external volumes in a pool must use the same Cache Mode setting.
After mapping and formatting an external volume, it is ready to use as a pair volume. The following
figure shows an example of an external volume used as a Pool-Vol.
NOTE: All volumes in an external snapshot pool come from the same external storage array.
Cache Residency 25