DSM/Tape Catalog User's Guide
Configuring DSM/TC
DSM/Tape Catalog User’s Guide — 520233-008
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Default NL and BLP Behavior
BLPCHECK
When BLPCHECK is set to ON and a BLP request is made by an application, this
message appears on the tape console and is sent to EMS:
... REQUEST TO USE $tape WITH NO LABEL PROTECTION
To respond to this request, use the ACCEPT TAPEMOUNT or REJECT TAPEMOUNT
command.
When BLPCHECK is set to OFF and a BLP request is made by an application,
processing occurs with no user intervention.
BLPCHECK and Premounted Labeled Tapes
The setting of BLPCHECK affects the use of a premounted labeled tape on a tape
drive. If BLPCHECK is set to ON when a tape drive is opened for write access in BLP
mode, a premounted labeled tape is unloaded to protect it from accidental use. To use
the premounted tape, 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 labeled tapes in BLP mode with cataloged labeled tapes. If you need this
kind of tape processing, use labeled tapes that are separate from the labeled tapes
managed by DSM/TC.
NLCHECK
When NLCHECK is set to ON and an NL request is made by an application, this
message appears on the tape console:
... REQUEST TO USE $tape UNLABELED
To respond to this request, use the ACCEP
T TAPEMOUNT or REJECT TAPEMOUNT
command.
When NLCHECK is set to OFF and an NL request is made by an application,
processing occurs with no user intervention.
Examples
To have one tape drive on \SEA not require approval for BLP processing, issue an
ALTER TAPEDRIVE command from \SKY, the current default node:
MC> ALTER TAPEDRIVE \SEA.$TAP007, BLPCHECK OFF
To have all tape drives on the current default node not require approval for NL
processing but require approval for BLP processing, issue this ALTER TAPEDRIVE
command on that node:
MC> ALTER TAPEDRIVE *, BLPCHECK ON, NLCHECK OFF