Use the QLIB option of the DEVSERV command to:
- Request a list of tape library subsystems that are
defined to the host. Libraries are listed by serial number (library-id).
If the specified library is a composite library, its distributed library
names are also displayed.
- Request a list of devices within a library. Devices are listed
by device number and displays the library port for each device.
- Validate the connection status of devices in a library, for example,
devices that are connected to the host.
- Delete an improperly defined library control block in preparation
for an IODF activate.
- Issue a diagnostic state save order to a library when requested
by the IBM® Support Center.