Method for managing roll forward and roll back logs of a transac

Details Method for managing roll forward and roll back logs of a transac Method for managing roll forward and roll back logs of a transac

1994-10-25

1997-01-21

Beausoliel, Jr., Robert W.

Boots, shoes, and leggings

39518214, 3642802, 364285, G06F 1134

Patent

active

055967108

ABSTRACT:
A method is provided for operating on a transaction object in a controller, such as a disk array controller. The transaction object maintains a roll forward log which holds action items to be performed, and a roll back log which lists action items already performed. In the event of power failure, the controller might be in the midst of a complex operation involving many action items. When power is restored, the controller determines whether to complete the operation using the roll forward log, or undo the operation using the roll back log. The method includes a simplified sequence, keyed to a single instruction of clearing the roll back log, which effectively makes this determination and thereby renders atomic the entire operation with respect to power failure.

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