Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2005-08-23
2005-08-23
Chace, Christian P. (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C707S793000, C707S793000, C714S006130, C714S015000, C714S020000
Reexamination Certificate
active
06934822
ABSTRACT:
A file server maintains a production file system supported by a clone volume, and multiple snapshot file systems supported by respective save volumes in a snapshot queue. Before a data block is modified for the first time after creation of the youngest snapshot, the data block is copied from the clone volume to the save volume of the youngest snapshot. A bit map indicates the blocks that have already been copied, and a block map shows the save block address for each corresponding clone block address. When a new snapshot is created, the bit and block maps are converted to a hash index that is kept linked to the save volume of what had been the youngest snapshot. When other than the oldest snapshot file system is deleted, the respective save volume is retained as a hidden object until it becomes the oldest save volume.
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Angelone Raymond A.
Armangau Philippe
Bergant Milena
Potnis Ajay S.
Wang Hongmei
Auchterlonie Richard C.
Chace Christian P.
EMC Corporation
Novak Druce & Quigg, LLP.
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