Cache/disk subsystem with tagalong copy

Details Cache/disk subsystem with tagalong copy Cache/disk subsystem with tagalong copy

1980-11-14

1983-12-06

Thomas, James D.

Boots, shoes, and leggings

371 10, G06F 1300, G06F 1116

Patent

active

044197250

ABSTRACT:
A system including a host processor, a disk drive device and a cache store for storing segments of data most recently used or most likely to be used, is provided with a separate store for storing a segment descriptor table. The table has an entry therein corresponding to each segment in the cache store and an entry in the table is formed or reformed each time data is written into its corresponding segment in the cache store. A copy of the segment descriptor table entry thus formed is stored in the cache store at the end of its corresponding data segment. The segment descriptor table entries are normally utilized to manage their corresponding segments. If the store for the table should fail, the copies of the segment descriptor table entries in the cache store may be utilized to control the transfer of data segments in the cache store to their proper locations in disk storage.

REFERENCES:
patent: 3636331 (1972-01-01), Amrehn
patent: 3737881 (1973-06-01), Cordi et al.
patent: 4101969 (1978-07-01), Lawson et al.
patent: 4150428 (1979-04-01), Inrig et al.
patent: 4215460 (1980-07-01), Denko

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