Guardian User's Guide

Using Labeled Tapes
Guardian User’s Guide—425266-001
10-28
Premounting and Scratching Labeled Tapes
Premounting and Scratching Labeled Tapes
System operators might be asked to premount labeled tapes in tape drives or to create
scratch tapes for labeled-tape processing. This subsection describes each of these tasks
and how to handle potential problems.
Premounting Labeled Tapes
All labeled tapes can be mounted before a tape mount request. When premounting a
labeled tape, remember:
•
Unload the premounted labeled tape if you are going to accept another request to use
that drive.
•
For operations that require multiple volumes, all volumes must be mounted on the
same drive. Do not premount the continuation volume on another drive unless you
are performing TMF backups or using the BACKUP program.
•
When a premounted tape is used, you do not see the mount request for that drive.
Handling Tapes Unloaded by the System
Sometimes when you premount a labeled tape, the system unloads it. Possible solutions
to some common problems include:
•
If you premount a tape and it is unloaded after being placed online, look for the
following error message:
•
For error code 151, either the tape is blank or the density of the data on the tape
is lower than the density switch setting on the drive.
•
For error code 120, the density of the data on the tape is higher than the density
switch set on the drive.
•
If the tape is unloaded at all density settings, either the tape is blank or the data
is written at a density that is unacceptable to the drive.
•
If you mount a tape to satisfy a request and the tape is unloaded after being placed
online, look for an error message in the Event Management Service (EMS) log:
•
If you used an incorrect tape, find the correct tape and mount it on the drive. If
the correct tape is not available, reject the request with the MEDIACOM
REJECT TAPEMOUNT command.
•
If the tape volume is not expired, and that volume was specifically requested by
a user, check with the user. The wrong tape might have been requested, or you
might have to scratch that tape with the MEDIACOM ADD TAPELABEL
command, SCRATCH option.
$tape-device: ERROR 1 - CANNOT PERFORM VOLUME RECOGNITION.
ERROR error-code