Bypassing Label Protection In Blp Mode - HP Guardian User Manual

Using Labeled Tapes
If your application does not allow time to mount the tape, the results can be
unpredictable. In this case, mount the tape before the application needs it.
Note. If a standard labeled tape is mounted on a tape drive that is opened in NL mode, the
system rejects the tape and displays an error message.
Using an Unlabeled Tape With a TAPE DEFINE
1. Create a TAPE DEFINE for each tape file.
For NL mode, specify LABELS OMITTED and the name of the tape drive you want
to use for DEVICE.
This example shows a TAPE DEFINE named =NOLABEL_RUN for NL mode:
20> ADD DEFINE =NOLABEL_RUN, CLASS TAPE, &
20> &LABELS OMITTED, DEVICE $TD1, &
20> &MOUNTMSG "Employee subvolume copy. Need by 3:00 PM."
2. Mount the tape, or deliver the tape to the operator with instructions that include:
The open mode (NL)
The name of the tape drive your application will use
The time you will run the application that needs the tape
3. Run your application.
If you run an application, make sure that your application specifies the TAPE
DEFINE that describes the tape file you want. If your application lets you specify
the TAPE DEFINE on the TACL command line, you must enter the correct name of
the TAPE DEFINE.
4. Mount an unlabeled tape depending on the value of NLCHECK, as described in
Using an Unlabeled Tape Without a TAPE DEFINE

Bypassing Label Protection in BLP Mode

In BLP mode, the system does not check the label of the tape mounted on the drive. If
you issue a TAPECOM ACCEPT command, there is no protection against overwriting
data on the tape.
To open a tape file in BLP mode:
1. Create a TAPE DEFINE for the tape.
For BLP mode, specify LABELS BYPASS and the name of the tape drive for
DEVICE.
This example shows a TAPE DEFINE named =BYPASS-JOB for BLP mode:
30> ADD DEFINE =BYPASS-JOB, CLASS TAPE, DEVICE $DR2, &
30> &MOUNTMSG "HIGH-PRIORITY! Call when finished"
Guardian User's Guide —425266-001
10- 8
Bypassing Label Protection in BLP Mode
on page 10-7.