[Solved] df reports negative value on a local filesystem

rockHardRideFre · #1 March 1st, 2010, 13:55

Hi,

I have a FreeBD 7.2 i386 on AsRock Conroe 1333 with 2 IDE and 1 SATA disks. I made 2 partitions on this SATA disk, one for a network file share, and one for backup. Both have the UFS2 filesystem. For several months everything was ok but recently after having nearly filled the backup partition, df reports negative value for "Available":

Code:

Filesystem            Size    Used   Avail Capacity  Mounted on
/dev/mirror/gm4s1a    496M    154M    302M    34%    /
devfs                 1.0K    1.0K      0B   100%    /dev
/dev/mirror/gm4s1e    496M     22K    456M     0%    /tmp
/dev/mirror/gm4s1f     67G     24G     38G    38%    /usr
/dev/mirror/gm4s1d    1.9G    174M    1.6G    10%    /var
/dev/ad10e            144G     67G     66G    51%    /usr/samba-shares/personal
/dev/ad10f            144G    136G   -3.6G   103%    /media/bkp

Of course, this contradicts with "Size"-"Used", and du also tells that 136G are used (that should mean 8G are available).

Why is this? Should I fix something or just ignore?

Thanks in advance.

graudeejs · #2 March 1st, 2010, 14:02

8% are reserved for root by default, you see "negative space" because you are using reserved space
This had been discussed many times on this forum (search for similar threads)

fronclynne · #3 March 1st, 2010, 17:04

See tunefs(8), especially read the section under "-m minfree" very carefully. Also, from fs(5):

Code:

The fs_minfree element gives the minimum acceptable percentage of file
     system blocks that may be free.  If the freelist drops below this level
     only the super-user may continue to allocate blocks.  The fs_minfree ele-
     ment may be set to 0 if no reserve of free blocks is deemed necessary,
     however severe performance degradations will be observed if the file sys-
     tem is run at greater than 90% full; thus the default value of fs_minfree
     is 10%.

rockHardRideFre · #4 March 2nd, 2010, 07:45

Thanks. It's clear now.

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
/ filesystem reports 102%	ilemur	General	1	February 27th, 2010 16:09
[Solved] smartctl reports Reallocated_Sector_Ct FAILING_NOW.	sixtydoses	System Hardware	3	December 17th, 2009 01:26
Abuse reports	bluetick	Off-Topic	4	September 14th, 2009 18:34
security reports?	Lem0nHead	General	3	August 27th, 2009 01:54
Reproducable ZFS panic ("vrele: negative ref cnt")	exscape	General	5	May 21st, 2009 20:47

The Following User Says Thank You to graudeejs For This Useful Post:
rockHardRideFre (March 2nd, 2010)

The Following User Says Thank You to fronclynne For This Useful Post:
rockHardRideFre (March 2nd, 2010)