MIA Command

[Authorization: OPERATOR]

Use the MIA command to control and display information about the interface between CA VM:Tape and CA MIA, the CA Multi-Image Allocation product.

This interface lets CA VM:Tape operate in a shared tape drive environment without an operator or STAM.

The normal status for the interface is STARTED. One mount or allocate request at a time can communicate with CA MIA. Requests use the interface on a first-in, first-out basis.

The interface is restarted and maintained automatically and normally does not require operator attention, even when CA MIA is reinitialized. However, if a problem occurs on CA MIA that prevents it from responding to requests from CA VM:Tape, you can halt the interface using the MIA command.

When you halt the interface, CA VM:Tape drains the drives under CA MIA control and tries to use the remaining drives for allocation requests. If no drives are available, CA VM:Tape makes those requests pending allocation requests, which simply wait until CA MIA is available again.

Mount requests waiting for CA MIA allocation when the interface is halted contend for allocation on non-CA MIA-controlled devices until you manually dedicate the drained CA MIA drives to the VM system and start them. The mount requests then begin using CA MIA drives again. When you restart the interface, the drives controlled by CA MIA will operate in the normal shared mode.

Note: For information about implementing the CA MIA interface, see the Administration Guide.