DSM/Tape Catalog Operator Interface (MEDIACOM) Manual

MEDIACOM Commands
DSM/Tape Catalog Operator Interface (MEDIACOM) Manual—429828-010
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ALTER TAPEDRIVE Command (Super Group Only)
use. If the premounted tape should be used, you must issue an ACCEPT
TAPEMOUNT command to permit BLP processing and reload the tape on the drive
so the application can access it.
If BLPCHECK is set to OFF when a tape drive is opened for write access in BLP
mode, a premounted labeled tape is not unloaded. The application is given access
to it without further approval.
Do not use cataloged labeled tapes in BLP mode. If you require this type of tape
processing, use labeled tapes that are kept separate from the labeled tapes
managed by DSM/TC.

NLCHECK ON
When NLCHECK is set to ON and an NL request is made by an application, this
message displays on the tape console:
... REQUEST TO USE $tape UNLABELED
Use ACCEPT TAPEMOUNT or REJECT TAPEMOUNT to respond to this request.

RESERVE ON
Using RESERVE prevents deadlock when two applications require two tape drives.
A reserved tape drive is assigned to an application in any of these circumstances:

The application already has a tape drive open on the same system.

The application specifies the tape drive in the device attribute of the DEFINE.

The application opens the drive for unlabeled processing.
Examples

You want one tape drive on \SEA to not require approval for BLP processing. Issue
an ALTER TAPEDRIVE command from \SKY, the current default node:
MC> ALTER TAPEDRIVE \SEA.$TAP007, BLPCHECK OFF

You want all tape drives on \SKY to not require approval for NL processing to but
require approval for BLP processing. Issue this ALTER TAPEDRIVE on \SKY:
MC> ALTER TAPEDRIVE *, BLPCHECK ON, NLCHECK OFF

Part of your tape inventory is stored in an tape library that has only one LSM. The
LSM has two tape drives. To assign NonStop Kernel tape names to these tape
drives requires two ALTER TAPEDRIVE commands:
MC> ALTER TAPEDRIVE $ACS01, LSM (0,0,9,0)
MC> ALTER TAPEDRIVE $ACS02, LSM (0,0,9,1)