Method and apparatus for enabling transfer of compressed data re

Details Method and apparatus for enabling transfer of compressed data re Method and apparatus for enabling transfer of compressed data re

1998-01-23

2000-05-02

Robertson, David L.

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

711112, 714799, 714807, G06F 1314, G06F 1100

Patent

active

060584629

ABSTRACT:
A system incorporating the invention stores data on communicating disk drives in such a manner as to enable recovery of the data in the event a failure of one of the disk drives. The system includes a first disk drive and a second disk drive, both for storing compressed data records in compressed track formats. Each compressed data record includes a CRC value. A cache stores compressed tracks of data records that are read from the first disk drive and a CRC value is calculated for each stored track of compressed data records. That CRC value is appended to the compressed track. A switch is coupled between the cache, a host processor and the second disk drive for dispatching and receiving tracks of compressed data records between the first disk drive and the second disk drive. The switch includes computational circuitry for calculating a CRC value for each track of compressed data records received from the cache and for determining a match or non-match state with the CRC value appended to each track of compressed data records. In such manner, a system which is primarily adapted to handle records with appended CRC values is adapted to handle tracks of compressed data records with appended CRC values so as to assure data integrity.

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