In case no one else has mentioned it... reserved blocks. 

Sent from my iPhone

On Nov 4, 2010, at 8:10 AM, "Jonathan S Billings" <[email protected]> wrote:

> On 11/04/2010 07:57 AM, Nick Lunt wrote:
>> So either df is wrong, I'm blind, or bc can't do take aways ;)
>> 
>> Anyone know why df is wildly inaccurate ?
> 
> It has to do with the reserved blocks:
> 
> 
> % dumpe2fs -h /dev/sda3 | egrep 'Reserved block count|Block size'
> dumpe2fs 1.39 (29-May-2006)
> Reserved block count:     935585
> Block size:               4096
> 
> % df -B4096 /
> Filesystem           4K-blocks      Used Available Use% Mounted on
> /dev/sda3             18125330   2651427  14538318  16% /
> 
> % bc
> bc 1.06
> Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
> This is free software with ABSOLUTELY NO WARRANTY.
> For details type `warranty'.
> 18125330 - 2651427
> 15473903
> 15473903 - 14538318
> 935585
> 
> 
> 
> -- 
> Jonathan Billings <[email protected]>
> College of Engineering - CAEN - Unix and Linux Support
> 
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