Maintaining duplex-paired storage devices during gap processing using of a dual copy function
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United States of America Patent
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Sep 24, 1991
Issued Date -
N/A
app pub date -
Nov 19, 1990
filing date -
Aug 25, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A technique is described for managing data storage devices and the data stored on them. A pair of data storage devices are maintained as identical copies. The dual copy function is provided without changing any current system or application software on the host. A set of status information is maintained for each record on the data storage devices. This status information includes information which allows only the changed records to be copied to a secondary device of the dual copy. This technique also provides high availability of data storage devices by swapping a failing data storage device with a good data storage device without host intervention. A joint array structure is used for routing host requests for information to and from the correct data storage device and keeping status information concerning the data storage devices.
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