What happen with disk space?

Reply: Guido Falsi via freebsd-hackers : "Re: What happen with disk space?"
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From: Rozhuk Ivan <rozhuk.im_at_gmail.com>
Date: Mon, 15 Nov 2021 15:54:55 UTC


# df -cHi
Filesystem                                             Size    Used   Avail Capacity iused ifree %iused  Mounted on
....
/dev/concat/16TB________.eli                            16T     16T    9.0G   100%     22k  246M    0%   /mnt/16TB________
/dev/mirror/10T________.eli                            9.7T    8.8T    124G    99%     45k  1.2G    0%   /mnt/10T________
/dev/gptid/87978976-10a9-11eb-ad6e-346346346346.eli    5.8T    4.1T    1.3T    76%    1.3M  732M    0%   /mnt/backup
/dev/ada3p1.eli                                        5.8T    4.1T    1.3T    76%    1.3M  732M    0%   /mnt/tmp

Why Size != Used + Avail?
UFS2 in all cases.