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Data migration using parallel, distributed table driven I/O mapping

  • US 20020019922A1
  • Filed: 06/01/2001
  • Published: 02/14/2002
  • Est. Priority Date: 06/02/2000
  • Status: Active Grant
First Claim
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1. A method for moving information from a first physical storage location to a second physical storage location in a virtual storage system for linking a host to the storage locations, the system having an agent connected to the host, the agent storing a table, the table having entries that map to virtual storage disk positions to the locations on the storage devices, the table entries including an indication of whether a no-write (Nw) state is activated, whereby activation of the Nw state prevents writing operations to the storage location contained in that entry, and a controller connected to the agent, the controller controlling the contents of the table, the method comprising the steps of:

  • a) the controller activating the Nw state for the table entry corresponding to the first physical storage location;

    b) copying information from the first physical storage location to the second physical storage location;

    c) the controller changing the virtual mapping from the first physical location to the second physical location; and

    d) the controller deactivating the Nw state for the table entry corresponding to the second physical storage location.

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