I need to migrate a 1.4Tb lun from one filer to another with minimal downtime (< 30 mins).  So clearly some copying of data has to be done prior to the actual move. 

Would snapmirror or flexclone be the most appropriate for this?   I’m not sure how I would get a consistent copy of the lun over to the other filer.  This is not a database, the lun contains flat files on NTFS.

Thanks

Suresh