A method for migrating from a source storage system to a target storage system includes defining a volume defined on a device to be migrated in the source storage system as an external volume to the target storage system; causing the host to access the volume on the drive to be migrated through an input/output...http://www.google.de/patents/US7269667?utm_source=gb-gplus-sharePatent US7269667 - Disk array system and method for migrating from one storage system to another
