Fault tolerant disk array data storage subsystem
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United States of America Patent
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Oct 17, 1995
Issued Date -
N/A
app pub date -
Sep 27, 1994
filing date -
May 15, 1992
priority date (Note) -
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Abstract
A pair of operationally independent disk drive array data storage subsystems are used to emulate one or more physical devices shared between two control modules. The storage control units of the two data storage subsystems are interconnected by at least one data link to exchange control and data signals therebetween. The storage control units of both data storage subsystems are synchronized to maintain identical virtual device images of certain assigned virtual devices both of the data storage subsystems wherein the duplicated data records of the single virtual device are stored. The data records are therefore stored in available memory on both of the two data storage subsystems. Data is exchanged over the data link to maintain consistency of the two sets of mapping tables.
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