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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 20 Jul 2005 09:46:11 -0400
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Subject: Re: df size mismatch
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a.shterenlikht@manchester.ac.uk writes:

> why does df show that used+available < size?
> in my case there is 20M missing for smaller partitions and
> 6GB missing for the larger one. How much can I really use?
> 
> anton
> 
> pw29# df -m
> Filesystem  1M-blocks Used Avail Capacity  Mounted on
> /dev/ad0s1a       247  129    98    57%    /
> devfs               0    0     0   100%    /dev
> /dev/ad0s1e       247    0   227     0%    /tmp
> /dev/ad0s1f     27172 1453 23544     6%    /usr
> /dev/ad0s1d       247    5   222     3%    /var

See "man 8 tunefs" and note "minfree".  Also see:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#DISK-MORE-THAN-FULL

-- 
Lowell Gilbert, embedded/networking software engineer, Boston area
		http://be-well.ilk.org/~lowell/