Hi Hans, You are incorrect, the source (directory) is 2TB in size:
root@eagle:~# du -sh /mnt/sdb1/data-mirror 2.0T /mnt/sdb1/data-mirrorand the destination drive (started blank and empty) reported 3.7 TB capacity.
The question is why rsync and disk space tools disagree whether there should be space available or not.
Regards, Adam