Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2006-02-14
2006-02-14
Peikari, B. James (Department: 2189)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C707S793000, C707S793000, C707S793000, C711S161000, C711S162000
Reexamination Certificate
active
07000145
ABSTRACT:
Disclosed is a technique for applying changes back to an original copy of data to reduce an amount of data transferred. A first indicator is maintained for each block of data in a first storage to indicate whether the block of data has been updated in the first storage since the block of data was last transferred to a second storage. A second indicator is maintained for each block of data in the second storage to indicate whether the block of data has been updated in the second storage since the block of data in the second storage was overwritten by a corresponding block of data in the first storage. Upon receiving a reverse restore operation, each block of data in the second storage for which a second indicator has been set to indicate that the block of data has been updated is transferred to the first storage and each block of data in the second storage that corresponds to a block of data in the first storage for which a first indicator has been set to indicate that the block of data in the first storage has been updated is transferred to the first storage.
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Brown Theresa Mary
Fienblit Shachar
Hayardeny Amiram
Jarvis Thomas Charles
Matosevich Rivka Mayraz
Davda Tanaki K.
International Business Machines - Corporation
Konrad Raynes & Victor LLP
Peikari B. James
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