System for concurrent cache data access by maintaining and selec

Details System for concurrent cache data access by maintaining and selec System for concurrent cache data access by maintaining and selec

1995-12-11

1998-06-30

Pan, Daniel N.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

711122, 395853, G06F 1202, G06F 1314

Patent

active

057746826

ABSTRACT:
A system for providing multiple hosts with concurrent access to cached data by selectively generating, maintaining, modifying, and consolidating multiple versions of data items in cache memory to efficiently accommodate data access requests by the hosts. Data associated with a logical track is represented in cache by a number of cache track image parts. Each part represents one or more records in cache, where multiple parts may exist in cache for the same logical track. The provision of multiple parts supports concurrent access by multiple operations or "processes" to data associated with a track. Namely, each part is given a "status" selected from a predetermined catalog of statuses; the assigned status thus establishes the permissible manner of accessing that part. Depending upon a part's status, the part may be used by one process (e.g. Read) or by multiple processes concurrently (e.g. Read and Destage). Other part statuses dedicate a part to a single process (e.g. Write). Multiple parts, not being actively used by a process, may be combined by a merge function to represent the most current image of the track.

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