×

Mechanism for reliable update of virtual disk device mappings without corrupting data

  • US 6,161,191 A
  • Filed: 05/12/1998
  • Issued: 12/12/2000
  • Est. Priority Date: 05/12/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A distributed computing system comprising:

  • one or more nodes coupled to a communication link and one or more storage devices coupled to said one or more nodes wherein said one or more nodes include one or more devices; and

    a highly available database accessible by said one or more nodes, wherein said database provides coherent data to said one or more nodes in the presence of a failure;

    wherein a mapping of said one or more devices to said one or more storage devices is stored in said highly available database;

    wherein when said mapping is updated, said one or more nodes stop issuing data requests to said one or more storage devices prior to said highly available database updating said mapping, and said one or more nodes resume issuing data requests when said mapping is updated;

    wherein said nodes send an acknowledge signal to said highly available database when said nodes have stopped issuing data requests.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×