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Correcting Tape Mount Errors

IP.com Disclosure Number: IPCOM000052794D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Bittihoffer, JR: AUTHOR

Abstract

Tape volumes (reels) are mounted by an operator onto a tape recorder pursuant to a message issued to the operator by a host CPU. Occasionally, an operator will mount the wrong tape volume. The operator may not be able to find the correct tape volume. This situation can be accommodated when data is to be recorded on a tape volume by the host selecting an alternate next-best tape volume for recording data.

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Correcting Tape Mount Errors

Tape volumes (reels) are mounted by an operator onto a tape recorder pursuant to a message issued to the operator by a host CPU. Occasionally, an operator will mount the wrong tape volume. The operator may not be able to find the correct tape volume. This situation can be accommodated when data is to be recorded on a tape volume by the host selecting an alternate next-best tape volume for recording data.

The procedure follows the sequence of numbers 1-9 of the figure. A volume will be requested, which is identified as RVOLID (requested volume identification). A mount message is sent to the operator console at 2 for mounting RVOLID. The operator will mount a tape volume at 3, usually the correct volume. At 4, the mounted volume MVOLID is identified to the host which compares RVOLID with MVOLID. If there is a successful compare, data processing ensues. For a miscompare at 5 (wrong tape is mounted), the host sends a second message at 6 to demount the incorrectly mounted MVOLID and to remount a correct volume RVOLID. At the same time, at 7, a time-out timer is set up. This allows the operator a specified amount of time to correct the tape mount error. If the timer times out at 8, and a correct volume has not been mounted by the operator, a second try is made by issuing a second message, also indicated at 6. Upon a second time-out, then the host takes its own corrective action. It will select an alternate volume to record the data, such as...