wow, i resized it from command line
lun resize /vol/iscsi/iscsi_qtr/iscsi_vol0 -4g
it did resize it
but
when i went to the windows vm on snapdrive and rescanned it did show the drive as resized.
but in my computer is still shoed the old size.
So I went into windows disk management and rescanned. and it showed the new size.
BUT
it lost the drive letter and now the disk is showing as RAW not NTFS. so i guess this method of shrinking a lun makes you lose your drive and data?