df -h

A

akshin

Hi!
Please help me.
I have a freshly installed FreeBSD 12.2.
I have a total disk space /dev/da1p1 of 17TB.
The /dev/da1p1 disk is empty inside.
My question. Where did the 2 TB go?
Code: 
root@main33:/usr/home/user# df -h
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/da0p2     97G    4.5G     85G     5%    /
devfs         1.0K    1.0K      0B   100%    /dev
/dev/da1p1     17T    8.0K     15T     0%    /pool
 
There's some overhead from the directory structures and overall management of files. And there's the infamous 8% that's always reserved. A disk that's 100% full isn't 100% full, there's still 8% reserved space left only root is able to use. A disk that's completely full would show 108% usage.

Code: 
     -m free-space
             The percentage of space reserved from normal users; the minimum
             free space threshold.  The default value used is defined by
             MINFREE from <ufs/ffs/fs.h>, currently 8%.  See tunefs(8) for
             more details on how to set this option.
newfs(8)
 
grahamperrin said:
Infamous because (for example) ~2 of 17T would be a ridiculously large reservation for the vast majority of use cases?
Click to expand...
Depends on if you have billions of files or not. That's what tunefs is for. Also SSDs benefit from this, so Mr McKusick was ahead of his time. :)
 
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