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Method and system for providing consistent data modification information to clients in a storage system

  • US 6,952,758 B2
  • Filed: 07/31/2002
  • Issued: 10/04/2005
  • Est. Priority Date: 07/31/2002
  • Status: Active Grant
First Claim
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1. A storage system for providing data consistency to multiple clients, comprising:

  • a facility for storing data and data modification information, wherein the data is stored as data blocks; and

    a request processor for handling requests for data from the clients, said request processor capable of identifying data that has been modified during a given time interval based on the modification information and updating the modification information to ensure that the data accessed by the clients will be consistent, wherein the data modification information includes an Altered Block Map and a Toggle Block Map, the Altered Block Map indicating the modification status of the data blocks and the Toggle Block Map indicating which data blocks have been modified, wherein the Toggle Block Map includes a plurality of bits, each bit corresponding to a data block and said bit complemented when the data block is modified.

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