A library can be in a state of On, Off, or Unavailable.
When a library is On, it is under the control of the Sun SAM software. This enables the Sun SAM software to perform the following actions:
Discover the internal state of the library, such as the location of tapes or whether barcodes are used
Update the library catalog and other internal structures
When a library is Off, it is no longer under the control of the Sun SAM software, which stops I/O operations and the automatic movement of cartridges. The drives in the library continue to be in the On state.
You might want to turn off a library for the following reasons:
To stop Sun SAM operations for this library only
To power off the automated library
When a library is Unavailable, you can reconfigure the library, such as configuring its cartridges.
The Tape Library Summary page is displayed.
The Change State window is displayed.