Patent ID: 6728736
Filing Date: 2004-04-27
Classification: G06F,Y10S

Abstract:
A system for snapshot synchronization of a copy of a data file from a source storage volume in a simplex state to an established peer-to-peer remote copy (PPRC) volume pair in order to migrate the data file copy from a target storage volume of the established PPRC volume pair to a secondary storage volume of the established PPRC volume pair, the system comprising:a source storage volume in a simplex state, the source volume having a data file stored thereon, the source volume for receiving a series of write commands from a host, executing the series of write commands on the data file to generate an updated data file, and generating a record of the series of write commands; a target storage volume for receiving a snapshot copy of the data file from the source volume, receiving a snapshot copy of the write command record from the source volume, and generating data indicated by the write command record; and a secondary storage volume for receiving a copy of the data file from the target volume and receiving the data indicated by the write command record from the target volume the secondary volume storing the copy of the data file wherein the stored copy of the data file and the data indicated by the write command record are available for use by the secondary volume in generating a copy of the updated data file, wherein the target and secondary volumes together comprise an established PPRC volume pair.