Method for managing roll forward and roll back logs of a transaction object
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United States of America Patent
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-
Jan 21, 1997
Grant Date -
N/A
app pub date -
Oct 25, 1994
filing date -
Oct 25, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
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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