You can disconnect a single mapped external volume, or all the mapped volumes in an external system. You disconnect all volumes by disconnecting the system itself.
You disconnect a volume or system in order to perform the following operations:
- Turn off the power supply of the local or external storage system.
- Delete an external volume's mapping.
- Access a mapped external volume or volumes from the external storage system.
When you disconnect volumes, they stop accepting host I/O and all data in the cache memory is destaged to the volumes. The mapping settings are also preserved. When the volumes are reconnected, they are assigned the same settings.
When you disconnect an external system, the mapped external volumes in the system are also disconnected. This is the primary method for disconnecting all the mapped volumes in an external system.
Note: Before you delete a DP-VOL that has the
Data Direct Mapping attribute, it is necessary to disconnect the external volume that
has the Data Direct Mapping attribute. Disconnecting the external volume that has the
Data Direct Mapping attribute might output SIM RC=627xxx (xxx is the pool ID) indicating
pool-VOLs blockage. For more information regarding deleting a DP-VOL that has the
Data Direct Mapping attribute, see the Provisioning Guide.