Bug 91218

Summary: Disk Space Reported Incorrectly
Product: Base System Reporter: Jeff Molofee <nehe>
Component: i386Assignee: freebsd-i386 (Nobody) <i386>
Status: Closed FIXED    
Severity: Affects Only Me    
Priority: Normal    
Version: Unspecified   
Hardware: Any   
OS: Any   

Description Jeff Molofee 2006-01-02 13:20:03 UTC 
> df
Filesystem  1K-blocks      Used    Avail Capacity  Mounted on
/dev/ad4s1a    507630     62200   404820    13%    /
devfs               1         1        0   100%    /dev
/dev/ad4s1e    507630      1678   465342     0%    /tmp
/dev/ad4s1f 231470356 218205334 -5252606   102%    /usr
/dev/ad4s1d   2011694    117764  1732996     6%    /var
linprocfs           4         4        0   100%    /usr/compat/linux/proc
>

running sfill, drive is showing 102% capacity and a negative value for available.

How-To-Repeat: Manually fill drive (250 gig drive) and watch the available space after it passes 0
Comment 1 le freebsd_committer freebsd_triage 2006-01-02 22:01:29 UTC 
State Changed
From-To: open->closed

That's caused by the so-called "minfree" reserved space on the file 
system.  Please consult tunefs(8) and fs(5), and FAQ entry 
"9.26. How is it possible for a partition to be more than 100% full?"