Patent ID: 8473939

Claim:
A system for replacing an entirety of an existing storage subsystem with an upgraded storage system, comprising: a plurality of existing components, at least one of the plurality of existing components being a device, and the plurality of existing components included as part of the existing storage subsystem; and a plurality of upgraded components being connected to the at least one of the plurality of existing components, the plurality of upgraded components being another device, wherein the plurality of upgraded components is included as part of the upgraded storage system and at least one of the plurality of upgraded components is adapted for: creating support for a verify I/O command to be operable on the upgraded storage subsystem, creating a target volume in the upgraded storage subsystem having a same volume identification as a source volume in the existing storage subsystem, for a command received on the at least one of the plurality of upgraded components, invoking the verify I/O command on at least one of a comparable one of the plurality of existing components to verify the command, wherein if the command is verified, driving the command, and pursuant to creating the target volume having a same volume identification as the source volume, disguising at least one of a true volume and port identification of the target volume from the at least one of the plurality of existing components by presenting at least one of a true volume and port identification of the source volume as the at least one of the true volume and port identification of the volume.