Trying to understand disk usage numbers

[Toraen]

Recently back to Unraid and just in  the process of copying my data over from a Synology.   It's a slow process but I'm trying  to make sense of the disk usage numbers.

 

Setup:  2x16 TB drives (1 is parity, 1 data).    More drives coming when the data is off the Synology.

 

I am copying the data in chunks - the first batch is 4.7 TB.   It's been running several hours and a snapshot of various disk usages.

 

Mounting the share in windows:  3.4 TB done 

du -h on either /mnt/disk1 or /mnt/user/Data4 (share):  4.2 TB

Unraid dashboard:  4.6 TB / 16 TB

* The copy is still running, this was just a snapshot of the copy numbers

 

I mounted the synology share to unraid and I'm using rsync to copy the files to /mnt/user/Data4 in case that matters in a good or bad way.  I had a previous copy going from a windows machine with the Synology and Unraid mounted, but it failed halfway through so I used rm -rf on Data4 (again, in case that matters).

 

Thanks for any insight or tips.

 

Edited November 15, 2022 by Toraen

[JorgeB]

du uses TiB, GUI uses TB, Windows also uses TIB so it should be the same as du.