Maintaining duplex-paired storage devices during gap processing

Details Maintaining duplex-paired storage devices during gap processing Maintaining duplex-paired storage devices during gap processing

1990-11-19

1991-09-24

Lee, Thomas C.

Boots, shoes, and leggings

364243, 3642466, 364268, 3642681, 3642683, 3642685, 3642693, G06F 1300, G06F 1200, G06F 1216, G06F 1114

Patent

active

050518879

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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