公开(公告)号：EP2013973A2

公开(公告)日：2009-01-14

申请号：EP07794387.6

申请日：2007-04-26

Applicant: NETWORK APPLIANCE, INC.

Inventor： ZHENG, Ling ,  STAGER, Roger ,  JOHNSTON, Craig ,  TRIMMER, Don ,  FRANDZEL, Yuval

IPC: H03M7/00

CPC classification number: H03M7/00 ,  H04N19/20 ,  H04N19/23 ,  H04N19/25

Abstract: A technique for eliminating duplicate data is provided. Upon receipt of a new data set, one or more anchor points are identified within the data set. A bit-by-bit data comparison is then performed of the region surrounding the anchor point in the received data set with the region surrounding an anchor point stored within a pattern database to identify forward/backward delta values. The duplicate data identified by the anchor point, forward and backward delta values is then replaced in the received data set with a storage indicator.

公开(公告)号：EP2013790A2

公开(公告)日：2009-01-14

申请号：EP07794388.4

申请日：2007-04-26

Applicant: Network Appliance, Inc.

Inventor： ZHENG, Ling ,  ENGLISH, Robert, M. ,  MANLEY, Stephen, L. ,  LEWIS, Blake, H.

IPC: G06F17/30 ,  G06F11/14

CPC classification number: G06F11/1435 ,  G06F17/30085

Abstract: A system and method provides continuous data protection using checkpoints in a write anywhere file system. During a consistency point of a write anywhere file system, freed blocks are identified and are appended to a delete log for retention. A consistency point log is updated with a new entry associated with the consistency point. If the file system needs to retrieve its state at a particular point in time, the stored blocks of the delete log may be recovered.