Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2005-09-20
2008-12-16
Bragdon, Reginald G (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S162000, C711S168000, C711S210000
Reexamination Certificate
active
07467265
ABSTRACT:
One goal of consistency interval replication is to achieve a consistent copy of data generated by independent streams of writes from nodes in a clustered/distributed environment. Two writes to the same block from different nodes may arrive at a replication target in a different order from the order in which they were written to primary storage. A consistency interval coordinator may analyze a list of blocks modified during a consistency interval to determine conflict blocks written to by two different nodes during the same consistency interval. Conflict resolution may involve a node reading data for a conflict block from primary storage and forwarding it to the replication target or a node completing a suspended in-progress write for the conflict block. Once the conflicts have been resolved, the replication target may checkpoint the data modified during the interval and nodes may resume writes to the conflict blocks for the new interval.
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Baird Robert
Colgrove John A.
Karr Ronald S.
Kekre Anand A.
Kiselev Oleg
Bragdon Reginald G
Gu Shawn X
Kowert Robert C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Symantec Operating Corporation
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