MPE/iX System Utilities Reference Manual (32650-90908)

Chapter 6

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.