Methods and apparatus for node caching at the file level

Details Methods and apparatus for node caching at the file level Methods and apparatus for node caching at the file level

1995-02-03

1997-05-06

Kriess, Kevin A.

G06F 1202

Patent

active

056280149

ABSTRACT:
Methods and apparatus for caching files in DOS based computer systems are disclosed wherein the computer systems include a nonstandard drive in which files have been stored and from which files can be accessed, retrieved or written to, a computer CPU for generating instructions for accessing, retrieving or writing portions of desired files, wherein said instructions for accessing, retrieving or writing are generated through the use of DOS interrupt 21 and a drive, recognized by the computer CPU as a DOS drive, for storage and access, retrieval or writing of files, wherein the access, retrieval or writing of files from the drive can be achieved faster than access, retrieval or writing of files from the non-standard drive. A file handler monitors CPU generated instructions directed through DOS interrupt 21 and in response to instructions for accessing, retrieving or writing portions of the files, the file handler retrieves information contained in files from the non-standard drive and caches the information in the drive. The disclosed computer system can also include a plurality of non-standard and standard drives to which the file handler is attached. In such an embodiment, the file handler is either preset as to which of the non-standard drives should be cached or not, or the file handler includes code for selecting or not the nonstandard drives to be cached. Such selective caching can be extended to particular files as well. In addition, methods of nonstandard drive selection can be extended to include a plurality of standard drives.

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