Browse Prior Art Database

Read/Write Compatibility Assurance Of Multiple Drive Systems

IP.com Disclosure Number: IPCOM000052083D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Torrens, DE: AUTHOR

Abstract

Performing read/write compatibility assurance is essential in computer systems utilizing multiple tape drives. The diagram illustrates a technique for performing compatibility assurance by minimizing the number of tape moves of a test reel. The operation is carried out under a program control which is suitable for use by a customer engineer or a system user. The program indicates which drive a scratch or test reel is to be loaded into. The program then records the address and sequence of each drive as the scratch reel is moved.

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Read/Write Compatibility Assurance Of Multiple Drive Systems

Performing read/write compatibility assurance is essential in computer systems utilizing multiple tape drives. The diagram illustrates a technique for performing compatibility assurance by minimizing the number of tape moves of a test reel. The operation is carried out under a program control which is suitable for use by a customer engineer or a system user. The program indicates which drive a scratch or test reel is to be loaded into. The program then records the address and sequence of each drive as the scratch reel is moved.

One record is written on the scratch reel on the first drive and then read back on that drive. The scratch reel is then unloaded, and the message displayed on the first drive indicates the next drive to be tested.

The record written on the first drive will be read, and a new record will be written and read back on the second drive.

Each record is written in a new location on the tape, leaving all the previous records intact to be read in succeeding drives. This operation continues until M-1 drives in the subsystem have had the reel loaded twice.

The operating program determines when each drive has been loaded for the second time. The drive address and its sequential position are determined, and all records written after the record written by this drive will be read. The program examines additional drives until:
a. the scratch reel is loaded for the second time in one of the

drive...