Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1997-03-21
1999-05-04
Swann, Tod R.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
G06F 1200
Patent
active
059000090
ABSTRACT:
A digital data storage subsystem comprises a cache memory, a digital data store and a host adapter. The cache memory includes a plurality of cache slots, each of which caches digital data from the digital data store for access by the host adapter. The digital data store includes a disk drive, in which data is stored in the form of variable- or fixed-length records. The storage controller identifies one of said data storage sections as constituting a current owner of respective ones of the cache slot, and is responsive to record staging requests to selectively transfer records from the data storage section identified as the owner of said at least one cache slot to said cache slot for caching. In staging records for the current owner, the storage controller may, but need not, over-write records that were previously staged in the cache slot for previous owners. The host adapter is responsive to access requests requesting access to a record such that, if the record for which access is requested is in a cache slot, it can access the record, whether the record's data storage section is the current owner of the cache slot, or one of a predetermined number of previous owners of the cache slot for which the record was not overwritten for a subsequent owner. On the other hand, if the record is not in a cache slot, which may occur if, for example, it has not been staged in a cache slot or it was staged in a cache slot but has been overwritten while the cache slot was owned by a subsequent owner, the host adapter will generate a record staging request for processing by the storage controller.
REFERENCES:
patent: 5206939 (1993-04-01), Yanai et al.
patent: 5265232 (1993-11-01), Gannon et al.
patent: 5490261 (1996-02-01), Bean et al.
patent: 5530829 (1996-06-01), Beardsley et al.
patent: 5680576 (1997-10-01), Laudon
patent: 5682500 (1997-10-01), Vishlitzky et al.
patent: 5778394 (1998-07-01), Galtzur et al.
Bachmat Eitan
Vishlitzky Natan
EMC Corporation
Gunther John M.
Gupta Krish
Jordan Richard
Lee Felix B.
LandOfFree
System and method for accessing records in a cache slot which ar does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for accessing records in a cache slot which ar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for accessing records in a cache slot which ar will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1867328