Method of restoring and updating records in a disk cache system

Details Method of restoring and updating records in a disk cache system Method of restoring and updating records in a disk cache system

1995-11-06

1996-12-31

Gossage, Glenn

Boots, shoes, and leggings

395404, 395440, 395489, 39518204, 39518218, 39518318, 395494, 395419, 364DIG1, 36424341, 3642481, 3642685, 3642646, 364285, 36494492, 3649521, 3649642, 3649701, 364DIG2, G06F 1216, G06F 1300, G06F 1206

Patent

active

055902987

ABSTRACT:
A method of restoring write data in a disk cache system includes the steps of providing a host, a disk drive having a plurality of tracks including a plurality of records, a cache memory, a nonvolatile memory storing a directory which controls storing of tracks within the nonvolatile memory, and a disk controller. The disk controller writes tracks of data from the disk drive, including records addressed by a read command sent from the host, into the cache memory. The disk controller also writes tracks of data, including records updated by the host, into the nonvolatile memory in response to a write command sent from the host, and restores the records updated by the host to the disk drive during an idle time of the disk drive. A record in the nonvolatile memory is updated in response to the write command sent from the host. A start address and an end address of a record to be restored to the disk drive from the nonvolatile memory are updated in response to an address of a record updated by the host. Restoring of the record to the disk drive from the nonvolatile memory is performed in response to receipt of the start address and the end address of the record to be restored to the disk drive from the nonvolatile memory.

REFERENCES:
patent: 4419725 (1983-12-01), George et al.
patent: 4593354 (1986-06-01), Ushiro
patent: 4638425 (1987-01-01), Hartung
patent: 4827462 (1989-05-01), Flannagan et al.
patent: 4916605 (1990-04-01), Beardsley et al.

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