AIX Storage Management

An active physical volume is considered to be in an Available state since it will

continue to allow logical I/O to it to occur. The state of a physical volume can be

changed from active to not active to stop all logical I/O to it from occurring.

There are instances when access to file system or logical volume data needs to

be stopped, particularly if the physical volume is partially or wholly damaged,

and needs to be repaired or replaced. In a high security environment, it may be

necessary to physically remove a disk from the system and secure it in a secure

place for overnight periods. This may be achieved by making the physical

volume unavailable ...