Electrical computers and digital data processing systems: input/ – Access arbitrating
Reexamination Certificate
2011-08-16
2011-08-16
Kim, Hong (Department: 2188)
Electrical computers and digital data processing systems: input/
Access arbitrating
C711S114000, C711S158000, C711S162000, C707S610000, C714S004110, C709S232000
Reexamination Certificate
active
08001307
ABSTRACT:
An apparatus and a method to eliminate deadlock in a bi-directionally mirrored data storage system are presented. In some embodiments, a first and a second storage servers have established a mirroring relationship. To prevent deadlock between the storage servers and to reduce write latency, the second storage server may hold data received from the first storage server in a replication queue and send an early confirmation to the first storage server before writing the data to a destination volume if the first storage server is held up due to a lack of confirmation. In another embodiment, when the first storage server writes metadata of a persistent point-in-time image (PPI) to the second storage server, the second storage server may send a confirmation to the first storage server after copying the metadata, but before exporting the PPI at the second storage server.
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Dunn Andrew E.
Gole Abhijeet P.
Malaiyandi Prasanna K.
Owara Shane S.
Blakely , Sokoloff, Taylor & Zafman LLP
Kim Hong
Network Appliance Inc.
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