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: [email protected] [mailto:lustre-discuss-
>> [email protected]] On Behalf Of Verduzco, Benjamin P.
>> Sent: Monday, April 22, 2013 9:49 AM
>> To: Mohr Jr, Richard Frank (Rick Mohr)
>> Cc: [email protected]
>> 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:[email protected]]
>> Sent: Wednesday, April 17, 2013 5:07 PM
>> To: Verduzco, Benjamin P.
>> Cc: <[email protected]>
>> Subject: Re: [Lustre-discuss] OST corruption?
>>
>>
>> On Apr 3, 2013, at 1:52 PM, "Verduzco, Benjamin P."
>> <[email protected]> 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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