Share size misrepresented for Samba

@faugusztin wrote:

Hi,

i just created a 3 drive RAID5 array from 3TB drives. Thus it is ~8.1TiB of total disk space, from which i have ~5.4TB usable.

This is represented mostly correctly on web interface:
Shares: 5.49 TB Capacity
Pools: 5.46TB Capacity + 2.64TB Raid overhead
Disks: 8.12TB

All fine so far. Unfortunately when i mount the share under a letter in Windows 10, it shows that the share has a size 8.18TB.

Or is it down to the fact that the command line tools are misrepresenting these numbers as well, and Samba just reports the size reported by the OS ?
[root@nas ~]# df -h
Filesystem Size Used Avail Use% Mounted on
....
/dev/sda 8.2T 50G 8.2T 1% /mnt2/MediaPool
/dev/sda 8.2T 50G 8.2T 1% /mnt2/Media

[root@nas ~]# btrfs fi usage /mnt2/Media
WARNING: RAID56 detected, not implemented
WARNING: RAID56 detected, not implemented
WARNING: RAID56 detected, not implemented
Overall:
Device size: 8.19TiB
Device allocated: 0.00B
Device unallocated: 8.19TiB
Device missing: 0.00B
Used: 0.00B
Free (estimated): 0.00B (min: 8.00EiB)
Data ratio: 0.00
Metadata ratio: 0.00
Global reserve: 16.00MiB (used: 0.00B)

Thanks

Edit: On other side the disk use increases by the parity data too, so while it is a bit weird that it represents 8.1TB instead of 5.4TB, at same time percentually it is showing the correct disk use. Incorrect in absolute numbers (GB), correct in relative numbers (%).

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