Patent ID: 7882329

Claim:
A computer program product comprising a computer-readable medium including a computer readable program, wherein the computer readable medium is a member of a set of computer readable media consisting of a semiconductor or solid state memory, magnetic tape, a removable computer diskette, a rigid magnetic disk, an optical disk, a magnetic storage medium, volatile memory devices, and non-volatile memory devices, wherein the computer readable program when executed on a computer causes the computer to: receive a set of premigration messages, wherein a separate premigration message is received for each logical volume in a chain of logical volumes, wherein each of the premigration messages includes a unique message identifier shared by the premigration messages in the chain, a chain member identifier, a total number of members in the chain, a logical volume identifier, and premigration indicators; while processing the premigration messages in order of receipt of each of the premigration messages, receive a cancel message indicating that premigration of a logical volume in the chain is to be cancelled; in response to determining that the logical volume whose premigration is to be cancelled has not already been transferred to physical storage media, cancel premigration of the logical volume by removing a premigration message for that logical volume from the set of premigration messages; and continue to premigrate each other logical volume in the chain of logical volumes in order of receipt.