HP NonStop G-Series - Manual (Page 181)

Using Labeled Tapes
Guardian User’s Guide — 425266-001
10- 7
Using Unlabeled Tapes in NL Mode
Using Unlabeled Tapes in NL Mode
NL mode is the default mode for tape processing. You can select NL mode by:
•
Not using a TAPE DEFINE, or
•
Specifying LABELS OMITTED in a TAPE DEFINE.
Using an Unlabeled Tape Without a TAPE DEFINE
1. Mount the unlabeled tape, or deliver it 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 your application that needs the tape
If your application opens a specific tape drive by name, such as $TAPE1, or if your
application lets you specify a tape drive on the TACL command line, you must use
the correct name of the tape drive.
Processing continues according to the value of NLCHECK (which you can check
using the TAPECOM SHOW NLCHECK command):
•
If NLCHECK is on, the labeled-tape server $ZSVR displays this drive request at
the operator console:
This request includes:
•
The name of the labeled-tape server process ($ZSVR) and a message
sequence number (0125) identifying the request
•
The phrase REQUEST TO USE indicating that this is a request to use a
tape drive
•
The name of the requested tape drive ($TAPE2)
•
The phrase UNLABELED indicating NL mode
a. You, or an operator, should mount an unlabeled tape on tape drive $TAPE2.
b. Issue a TAPECOM ACCEPT command to let your application use this tape.
(A TAPECOM REJECT command causes your open request to fail with
file-system error 194.)
•
If NLCHECK is off, processing continues depending on the application you are
running. If your application allows time for you or an operator to mount a tape,
mount the tape on the specific tape drive ($TAPE2) when your application
requests it. Your application can then continue processing.
$ZSVR: 0125 REQUEST TO USE $TAPE2 UNLABELED