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Reliability and availability of distributed servers

  • US 9,124,666 B2
  • Filed: 12/21/2012
  • Issued: 09/01/2015
  • Est. Priority Date: 10/30/2002
  • Status: Active Grant
First Claim
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1. A distributed system comprising:

  • a first network proxy adapted to interface with a first client and a first server, wherein the first server includes a first copy of data; and

    a second network proxy adapted to interface with the first network proxy and a second server, wherein the second server includes a second copy of the data;

    wherein the first network proxy includes logic adapted to receive a write request to modify the data from the first client, logic adapted to locate a primary copy of the data, logic adapted to respond to the write request by modifying the first copy of the data on the first server if the first copy is determined to be the primary copy of the data, and logic adapted to respond to the write request by forwarding the write request to the second network proxy if the second copy of the data is the primary copy, wherein the logic adapted to locate a primary copy of the data includes logic to access a server map specifying a relationship between a shared directory of the first server and a shared directory of the second server, and wherein the server map designates a shared directory including the primary copy of the data as a local directory and a shared directory including a non-primary copy of the data as a broadcast directory.

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