[Lustre-discuss] OST corruption?

[Drokin, Oleg]

Hello!

   In reality there's no "used" or "reserved" in the statfs(2) output. All you get is total, free and avail.
   df and the likes typically calculate used as total-avail. Reserved would be avail-free.

Bye,
    Oleg
On Apr 26, 2013, at 10:56 AM, Andrus, Brian Contractor wrote:

> 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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