Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2005-09-13
2005-09-13
Thai, Tuan V. (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S100000, C709S205000, C709S213000
Reexamination Certificate
active
06944732
ABSTRACT:
A method for a file server to support snapshots in a storage area network (SAN) providing a plurality of clients with concurrent direct I/O access to a file system in the SAN, in which the SAN uses an access protocol for file system access. The method includes operating the file server to: start to maintain, at a time T1, a time T1snapshot volume of a live volume of data in the file system; receive, from a client C1at a time subsequent to T1, an update access request for a portion of a file that includes data stored in access unit B1of the live volume subsequent to time T1; and responsive to the update access request, allocate, to the time T1snapshot volume, a new access unit B2corresponding to access unit B1,and copy data stored in access unit B1to access unit B2.
REFERENCES:
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patent: 6434681 (2002-08-01), Armangau
patent: 6473775 (2002-10-01), Kusters et al.
patent: 6694413 (2004-02-01), Mimatsu et al.
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Rupp Lawrence E.
Thunquest Gary Lee
Hewlett--Packard Development Company, L.P.
Thai Tuan V.
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