Patent
1993-12-14
1996-10-22
Kim, Matthew M.
395446, 395460, 395489, 395403, G06F 1208
Patent
active
055686281
ABSTRACT:
A storage control unit is connected between a central processing unit having an interface for accessing a first disk unit into which data constructed of a plurality of variable length data records are stored in a first recording format, and a second disk unit into which data constructed of a plurality of fixed length data blocks are recorded in a second recording format. The storage control unit contains a plurality of first-level storage regions having a storage capacity equal to a track of the first disk unit, and the first-level storage regions have a plurality of cache memories constructed of a plurality of second-level storage regions having storage capacities equal to the fixed length blocks in the second recording format. In response to a data update request issued from the central processing unit, a control processor within the storage control unit judges whether or not the data of the fixed length data blocks containing the data records to be updated in the first recording format, are present in each of these cache memories. When there is such a cache memory having no data, the data of the fixed length data blocks containing the variable length data records to be updated are stored into this cache memory.
REFERENCES:
patent: 4423479 (1983-12-01), Hanson et al.
patent: 4875155 (1989-10-01), Iskiyan et al.
patent: 4956803 (1990-09-01), Tayler et al.
patent: 5146576 (1992-09-01), Beardsley et al.
patent: 5206939 (1993-04-01), Yanai et al.
patent: 5235692 (1993-08-01), Ayres et al.
patent: 5257362 (1993-10-01), Menon
patent: 5283884 (1994-02-01), Menon et al.
Ichinomiya Hiroshi
Satoh Takao
Takeuchi Hisaharu
Yamamoto Akira
Hitachi , Ltd.
Hitachi Microcomputer System Ltd.
Kim Matthew M.
LandOfFree
Storage control method and apparatus for highly reliable storage does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Storage control method and apparatus for highly reliable storage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Storage control method and apparatus for highly reliable storage will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2366960