Method of changing data on disk

Details Method of changing data on disk Method of changing data on disk

1987-03-26

1992-05-12

Heckler, Thomas M.

Boots, shoes, and leggings

364DIG2, 3649621, 3649581, 3649404, 36493146, 36493701, G06F 1202

Patent

active

051135094

ABSTRACT:
An input/output (I/O) test and set operation is provided for testing and changing data, e.g. flags in an access status record on DASD (Direct Access Storage Device) in one atomic I/O operation, which uses a string of standard channel command words (CCW) like Read, Write, Seek and Search in combination with additional records on DASD, containing the test and set values to be used by the CCW string. The I/O test and set operation is used in a Shared Disk facility (SDF) in a flagging protocol, for avoiding simultaneous and conflicting accesses from independent computer systems having access to the same physical DASD, thus realizing a disk sharing system at user or minidisk level.

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patent: 4658351 (1987-04-01), Teng
patent: 4805106 (1989-02-01), Pfeifer
patent: 4839813 (1989-06-01), Hills et al.

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