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Magnetic Tape Library Audit Controls

IP.com Disclosure Number: IPCOM000088383D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Hart, CW: AUTHOR

Abstract

A mass storage system of the staging/destaging type includes a mass storage facility (MSF) containing one or more walls of magnetic tape cartridge-containing cells, together with a pair of accessors under computer control. To move the magnetic tape cartridges to record-readback devices termed DRD, the control of accessors is under a library controller (LC). The mass storage control (MSC) directs the moves of the accessors such that cartridge transfer is performed on an efficient basis. From the DRDs, the hosts obtain signals from the magnetic tape cartridges and record signals on the magnetic tape cartridges via control units DIRSA (director-staging adaptor).

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Magnetic Tape Library Audit Controls

A mass storage system of the staging/destaging type includes a mass storage facility (MSF) containing one or more walls of magnetic tape cartridge- containing cells, together with a pair of accessors under computer control. To move the magnetic tape cartridges to record-readback devices termed DRD, the control of accessors is under a library controller (LC). The mass storage control (MSC) directs the moves of the accessors such that cartridge transfer is performed on an efficient basis. From the DRDs, the hosts obtain signals from the magnetic tape cartridges and record signals on the magnetic tape cartridges via control units DIRSA (director-staging adaptor).

Because there are a large number of moves of data magnetic tape cartridges between the cells and the DRDs, some cartridges may be misplaced or lost in MSF. Accordingly, it is desired to audit the cartridge content of MSF either on an entirety basis or on a selective portion basis. To do a valid audit, it is desired to freeze the cartridge status of MSF.

A host requests the audit from MSC. MSC is the programmed computer designed to operate the mass storage system, consisting of MSF and DIRSA. MSC microcode includes MSF code which controls MSF, DIRSA code which controls the DIRSAs which are also programmable units, and other codes which control operation of the mass storage system beyond the scope of the present description. The MSC, upon receiving an audit request from a...