MPE/iX System Utilities Reference Manual (32650-90882)

Chapter 6 103
DISCUTIL
Operation
For example, to see the current tape drive enter:
discutil>TAPE
To assign a logical device number as the
current tape drive enter:
discutil>TAPE 7
UNCONFIG
Use the UNCONFIG command to remove a device from the system's configuration. This frees
or releases the corresponding
ldev and physical path, making them available for
reassignment with the CONFIGURE command.
To invoke UNCONFIG enter:
discutil>UNCONFIG [LDEV=]
ldev
For example:
discutil>UNCONFIG 14
DISCUTIL messages and error handling
DISCUTIL displays three types of messages:
• information messages, which inform the operator about the status of DISCUTIL
• warning messages, which generally occur when the operator has made an error during
data input. Warning messages begin with WARNING - .
• error messages, which tell the Operator which errors DISCUTIL has encountered;
typically, device errors. Error messages begin with ERROR - .
If a tape error occurs you must re-enter all file sets when prompted for a new tape unless
the file sets were entered while a
previous tape was mounted. If the tape error occurred
while a
previous tape was mounted DISCUTIL will automatically resave all files on the
bad tape.
If an end-of-tape (EOT) is encountered in the middle of a file during DISCUTIL activity, the
break in the file will be placed on a page boundary. If a tape write error occurs, DISCUTIL
saves all files on the corrupt tape to a new tape. If part of that corrupt file is on the
previous tape, the whole file is written to the new tape. Two end-of-file (EOF) marks are
written to the tape any time DISCUTIL cannot save the entire file on a tape. VOLUTIL
RECOVER is sensitive to this message and aborts that file's recovery at a double EOF before
continuing.
Additional Discussion
For more information on the RECOVER command of VOLUTIL refer to the Volume
Management Reference Manual.
For more information on
resetting the system refer to the System Startup, Configuration,
and Shutdown Reference Manual.