The document discusses migrating a volume called CASESHARE_JPM004 to a new destination volume called CASESHARE_JPM004new using snapmirror migrate. It details running the snapmirror migrate command, monitoring the migration, renaming the volumes after migration is complete, and re-adding the CIFS share. The key steps are migrating the volume, monitoring the migration, renaming the source to a backup name and renaming the destination to the original source name, and re-adding the CIFS share on the new destination volume.