G - Physics – 06 – F
Patent
G - Physics
06
F
354/237
G06F 3/06 (2006.01) G06F 12/08 (2006.01)
Patent
CA 1169580
ABSTRACT OF THE DISCLOSURE In a buffered data storage subsystem, data is promoted to the buffer in anticipation of a connected host using the promoted data in the near future. In a tape recorder data storage apparatus the actual position of the tape reflects the last promoted data; such actual tape position is "inconsistent" with host operations. If the sequence of host operations continues, such inconsistency actually enhances total operations. When the subsystem detects a change or possible change in future host operations (rewind command, change in tape motion direction, etc.), detect end of file (tape mark) or a change in subsystem operations (load balance affecting drive or deallocation of buffer from drive) the data promoted to the buffer and not read by the host is erased from the buffer. The tape is moved such that upon a forward motion the tape drive would next read data on tape corresponding to the data block erased from the buffer. TU980013
394221
Hempy Harry O.
Kirkpatrick Charles R.
Robinson Francis L.
International Business Machines Corporation
Rosen Arnold
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