Re: /usr at 100%

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On Tue, Dec 31, 2002 at 09:51:02AM -0500, Peter Larsen wrote:
> Craig White wrote:
> > my /usr partition is almost completely filled up and it's bothering
> > me. 
> 
> > /dev/hda7              3099260   3090492         0 100% /usr
>
> There's no "almost" there :)

Yes, actually, there is.  Note the difference between the size column,
and the used column.  This filesystem has about 8.5MB free, but with
restrictions...

Unix systems reserve some percentage of free space on their file
systems for the root user, in the event that the file system does fill
up.  It leaves a margin for root processes to write to their files, or
for the system administrator to have some room to play to fix the
problem.

By default, an ext2/3 filesystem will reserve 5% of its blocks for
this purpose.  You can, in fact, have filesystems that are reported as
greater than 100% full, on some Unix systems, though Linux appears not
to be one of them.  Assuming the defaults were used, this file system
would have reserved 154,963 1K blocks (though the actual block size is
probably 4K), or about 151MB.  


- -- 
Derek D. Martin
http://www.pizzashack.org/
GPG Key ID: 0xDFBEAD02

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