Error detection/correction and fault detection/recovery – Pulse or data error handling – Replacement of memory spare location – portion – or segment
Reexamination Certificate
2007-05-29
2007-05-29
Ton, David (Department: 2138)
Error detection/correction and fault detection/recovery
Pulse or data error handling
Replacement of memory spare location, portion, or segment
C714S054000
Reexamination Certificate
active
10910714
ABSTRACT:
A method, apparatus, and article of manufacture containing instructions for processing multiple point-in-time consistent data sets. The method consists of creating multiple point-in-time data sets associated with a backup appliance which is associated with backup storage. Upon the transfer of a first update from a primary storage controller to the backup appliance, a determination is made whether the update affects data stored in the backup storage has been unchanged following the creation of the respective data sets. If the update does affect data which is unchanged following the creation of a data set, the current, non-updated data is read from the backup storage. A copy of the current, non-updated data thus read from the backup storage is stored in a storage location which can be one of the data sets or an independent memory location. In addition, pointers are associated with the remaining applicable data sets and directed to the copy at its storage location. Subsequently, the update is applied to the data on the backup storage device. In the event an update is subsequently transferred from the primary storage controller to the backup appliance which affects data stored in backup storage which has already been changed since the creation of an applicable data set, no further data is written to the applicable data set and the update is applied to the backup storage.
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Boyd Kenneth W.
Day III Kenneth F.
Doatmas Philip M.
Wolfgang John J.
International Business Machines - Corporation
Shifrin Dan
Ton David
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