System and method for on-line, real time, data migration

  • US 6,108,748 A
  • Filed: 02/28/1997
  • Issued: 08/22/2000
  • Est. Priority Date: 09/01/1995
  • Status: Expired due to Term
First Claim
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1. Data migration apparatus for migrating data from a donor disk array storage system to a replacement disk array storage system while continuing to respond to write requests from a host computer coupled to said replacement disk array storage system said apparatus comprising:

  • A) a data store, andB) a migration control that connects to the host computer and the donor disk array storage system thereby to redirect input-output requests from the host computer to the replacement disk array storage system and that migrates data from the donor disk array storage system to the replacement disk array storage system under the control of the replacement disk array storage system and that responds to data write requests from the host computer to locations in the replacement disk array storage system to which data has not yet been migrated by transferring the data associated with the write request to the replacement disk array storage system and by preventing the transfer of corresponding data from the donor disk array storage system to the replacement disk array storage system.

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