Organization of multiple snapshot copies in a data storage system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6934822
APP PUB NO 20040030727A1
SERIAL NO

10213242

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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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Patent Owner(s)

  • EMC IP HOLDING COMPANY LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Angelone, Raymond A Norfolk, MA 2 369
Armangau, Philippe Acton, MA 285 6346
Bergant, Milena North Grafton, MA 25 1784
Potnis, Ajay S South Grafton, MA 3 170
Wang, Hongmei Shrewsbury, MA 77 1123

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