Strange df on external HDD

SPlissken

SPlissken

Hello all

I have an external 1,5 TB USB hard disk.
I have formated it with UFS2 and copied differents files on it.

df command show this

Code: 
Filesystem  1K-blocks       Used      Avail Capacity  Mounted on 
/dev/da0s1  1419042678 1067768898 237750366    82%      /mnt/DD1

1067768898 (used) + 237750366 (free) = 1305519224

Where is the difference
1419042678 - 1305519224 = 113 523 454 (113 GB !!!!)

Any explanation are welcome
 
Some math: 1305519224 / 1419042678 ~ 9.2%

man newfs(8)
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%.
So by default you are not using about 8% of reserved space, the rest 1.2% (difference was 9.2%) is used by filesystem metadata/inodes.

Sollution: # tunefs -m 0 -o time /dev/da0s1
 
Also note the difference between the SI TB (10^12) and the binary TB (2^40).
 
You must log in or register to reply here.
Back
Top