Understanding the Use% column of the df command output

Question

Below is an output of df command

# df /boot
Filesystem     1K-blocks   Used     Available Use%  Mounted on
/dev/sda2         122835  26732     89550     23%   /boot

It seems that

Used =  1K-blocks - Available - Reserved

where Reserved can be retrieved using the below command:

tune2fs -l /dev/sda2 | egrep "Block size:|Reserved block count"

Reserved block count:     6553
Block size:               1024

But cannot understand how Use% is calculated. Shouldn't be it just:

 (Used / 1K-blocks) * 100

Or

(1K-blocks - Available)/(1K-blocks) * 100

score 3 · Accepted Answer · answered Oct 25 '20 at 11:21

3

The "Use%" is calculated this way:

Used / ( Used + Available ) * 100 %

answered Oct 25 '20 at 11:21

Pilot6

1 Answers1