Electrical computers and digital processing systems: multicomput – Distributed data processing
Reexamination Certificate
2006-12-12
2006-12-12
Etienne, Ario (Department: 2157)
Electrical computers and digital processing systems: multicomput
Distributed data processing
C709S218000, C709S219000, C707S793000, C707S793000
Reexamination Certificate
active
07149769
ABSTRACT:
A data storage system adapted to maintain redundant data storage sets at a destination location(s) is disclosed. The data storage system establishes a copy set comprising a source volume and a destination volume. Data written to a source volume is automatically copied to the destination volume. The data storage system maintains a data log that may be activated when the destination volume is inaccessible due to, for example, a malfunction in the destination storage system or in the communication link between the source system and the destination system. I/O commands and the data associated with those commands are written to the data log, and after a destination system becomes available the information in the data log is merged into the destination volume to conform the data in the destination volume to the data in the source volume. The data log competes for disk capacity with other volumes on the system, and log memory is allocated as needed. If multiple remote sites are provided, then the system permits to implements a merge fence to manage the process of merging data into multiple destinations.
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Elkington Susan
Hess Randy
Korgaonkar Anuja
Leveille Jason
Lubbers Clark
Etienne Ario
Hewlett--Packard Development Company, L.P.
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