The geographically mirrored independent disk pool maintains all of the
benefits of an independent disk pool, with its ability to be made available
or unavailable as well as allow flexibility for the following actions:
- You can protect the production copy and
mirror copy with your choice of protection, either disk unit mirroring or
device parity protection. The production copy and mirror copy are not required
to have the same type of protection.
- You can set the threshold of the disk pool to warn you when storage space
is running low. The server sends a message, allowing you the time to add more
storage space or to delete unnecessary objects. If the user ignores the warning
and the mirror copy disk pool becomes full, geographic mirroring is suspended.
If the user ignores the warning and the production disk pool becomes full,
the application stops and objects cannot be created.
- The mirror copy can be detached and then separately made available to
perform save operations, to create reports, or to perform data mining. When
the mirror copy is reattached, it is synchronized with the production copy,
and all modifications made to the detached copy are lost. Synchronization
can be a lengthy process.
- If you configure the independent disk pools to be switchable, you increase
your options to have more backup nodes that allow for failover and switchover
methods.