Managing switched logical units (LUNs)
Switched logical units are independent disk pools created from logical units created in an IBM System Storage that have been configured as part of a device cluster resource group (CRG). 
Ownership of data and applications that stored in a switched logical unit can be switched to other systems that have been defined in the device CRG. Switched disk technology provides high availability during planned and some unplanned outages.
- Making switched logical units (LUNs) available and unavailable
You can select an independent disk pool to make it unavailable or available. You cannot access any of the disk units or objects in the independent disk pool or its corresponding database until it is made available again. The pool can be made available again on the same system or another system in the recovery domain of the cluster resource group.
Parent topic: Managing PowerHA
Related concepts: