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Using Labeled Tapes
How Labeled-Tape Processing Works
When labeled-tape processing is enabled for your Compaq NonStop™ Kernel system
during system generation, to perform a typical mounting of a labeled-tape:
1. A user submitting a job to run sends a message to the operator console requesting:
A specific tape be mounted on any tape drive or on a specific tape drive
Permission to use a specific tape drive, if needed
2. The operator mounts the requested tape.
The system uses automatic volume recognition (AVR) to check the labels on the
mounted tape to ensure that the requested tape has been mounted.
If a user requests that a specific tape be mounted, and the operator mounts the wrong
tape, the tape remains online and a message similar to this is displayed:
UNREQUESTED ANSI TAPE AMBER1 ONLINE ON $TAPE1
A job does not start until the system determines that the requested tape is mounted.
The MEDIACOM Interface
Some MEDIACOM commands require that you log on as a super-group user (255,n),
but in general MEDIACOM lets you:
Configure DSM/TC
Label and catalog new tapes
Handle tape mount requests
Retrieve information from DSM/TC catalog entries
Manage the use of uncataloged tapes
To run MEDIACOM, enter:
> MEDIACOM
You can use the MEDIACOM commands and options in
other than DSM/TC. There are other MEDIACOM commands and options not described
in this guide that you can use only with systems that have a DSM/TC database installed.
When you enter HELP at the MEDIACOM prompt, all commands are displayed. Each
MEDIACOM command has a HELP option that lists full syntax and options. For
example, when you enter
MC> HELP STATUS TAPEDRIVE
MEDIACOM returns:
STATUS TAPEDRIVE [ \node.] $tape ] [ , BRIEF | DETAIL ]
Guardian User's Guide —425266-001
10- 2
How Labeled-Tape Processing Works
Table 10-1
in an environment
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