Disconnecting external systems and volumes
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.