Apparatus and method for copying and restoring disk files
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United States of America Patent
Stats
-
Jul 9, 1996
Grant Date -
N/A
app pub date -
Jul 22, 1993
filing date -
Jul 22, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and apparatus for backing up files from a logical disk are described to a backup tape and restoring all or part of the files to the logical disk. Separate 'backup' and 'copy' buffers in the host processor's main memory are employed during a backup operation. Backup buffers hold data read from the logical disk during the sequential backup operation. Copy buffers hold data read from the logical disk prior to execution of a write operation to a portion of the disk not yet backed up. Data is stored on the backup tape in logical tape records containing either backup data or copied data. A full restoration of all files can be done in one read of the backup tape. A partial restoration of selected files can be done in two reads of the backup tape.
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