Amount of disk space lost to formatting?

David Hubbard dhubbard at
Fri Apr 14 11:30:07 CDT 2006

NICE!! :-)

Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb1              68G  104M   68G   1% /data

Yeah, that's ridiculous.  I've never really paid attention
to the reserved space before because on our servers there's
always more than enough room.  This pair of drives was
for a customer's data though and he was wondering why the
available space on the drives he paid for was several gigs
less than what he expected to have.  LOL



> -----Original Message-----
> From: Jeff Garzik [mailto:jgarzik at] 
> Sent: Friday, April 14, 2006 12:19 PM
> To: Ron Waddell
> Cc: David Hubbard; linux-poweredge at
> Subject: Re: Amount of disk space lost to formatting?
> On Fri, Apr 14, 2006 at 12:07:53PM -0400, Ron Waddell wrote:
> > Use tune2fs to lower the amount of reserved space. I 
> believe the default is 
> > 5%.
> Yep.  This is probably the poster's problem, indeed.
> 'tune2fs -m0 $dev' will fix it.
> The reserved blocks eat MANY gigabytes.  The default is awful 
> for modern
> hundreds-of-gigabytes drives.
> I've poked the e2fsprogs authors about this, without success. 
>  So on my
> 500GB RAID1 partition, I reclaim 25GB from ext's stupidity 
> with tune2fs.
> 	Jeff

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