[Lustre-discuss] OST corruption?

Andrus, Brian Contractor bdandrus at nps.edu
Fri Apr 26 07:56:33 PDT 2013

FWIW, your total should be used+free+reserved
There is normally a % set aside for root only 
This is changeable too.
tune2fs -m 0 <device>

Brian Andrus
ITACS/Research Computing
Naval Postgraduate School
Monterey, California
voice: 831-656-6238

> -----Original Message-----
> From: lustre-discuss-bounces at lists.lustre.org [mailto:lustre-discuss-
> bounces at lists.lustre.org] On Behalf Of Verduzco, Benjamin P.
> Sent: Monday, April 22, 2013 9:49 AM
> To: Mohr Jr, Richard Frank (Rick Mohr)
> Cc: Lustre-discuss at lists.lustre.org
> Subject: Re: [Lustre-discuss] OST corruption?
> That's correct, the used and free don't equal the total.     While there
> is just about a 5% difference, I know the file system was reporting a more
> reasonable 158 T used before the reboot.
> Despite the file system size oddness, it seems to be working, so we'll keep it
> in service for now, but we're moving up our plans to replace our MDS and
> have consistent versions of both Lustre and the OS across all hosts.
> Thanks,
> Ben
> -----Original Message-----
> From: Mohr Jr, Richard Frank (Rick Mohr) [mailto:rmohr at utk.edu]
> Sent: Wednesday, April 17, 2013 5:07 PM
> To: Verduzco, Benjamin P.
> Cc: <Lustre-discuss at lists.lustre.org>
> Subject: Re: [Lustre-discuss] OST corruption?
> On Apr 3, 2013, at 1:52 PM, "Verduzco, Benjamin P."
> <BENJAMIN.P.VERDUZCO at saic.com> wrote:
> > *         When I brought the system up, it reported the used space
> incorrectly (df -h shows 166T total, 150T used and 7.1 T free)
> When you say that the used space is being reported incorrectly, do you
> mean that the sum of the used and free space does not match the total
> space?  Or do you have a reason to believe that 150 TB is not actually
> used?  If it is the former, then that could be explained by the fact
> that ext file systems by default reserve 5% of the disk space for the
> root user.
> --
> Rick Mohr
> Senior HPC System Administrator
> National Institute for Computational Sciences
> http://www.nics.tennessee.edu
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