question: public void migrateVolumeForExpansion ( URI vplexSystemURI , URI vplexVolumeURI , List < URI > targetVolumeURIs , Map < URI , URI > migrationsMap , Map < URI , URI > poolVolumeMap , String opId , String stepId ) throws ControllerException { WorkflowStepCompleter . stepExecuting ( stepId ) ; String successMsg = String . format ( "Virtual volume %s migrated successfully" , vplexVolumeURI ) ; String failMsg = String . format ( "Virtual volume %s migration failed" , vplexVolumeURI ) ; migrateVolumes ( vplexSystemURI , vplexVolumeURI , targetVolumeURIs , migrationsMap , poolVolumeMap , null , null , successMsg , failMsg , null , opId , stepId ) ; _log . info ( "Created and started sub workflow to execute the migration" ) ; }
target:  Migrate volumes to new targets for the purpose of expanding the volumes.