[lustre-discuss] Understanding quotas

[Nate Pearlstein]

I'll hazard a guess here and say that based on how lustre quotas are "quantized," space is granted in chunks and it is possible to slightly exceed ones quota based on the number of ost objects that were granted in order to meet an I/O request.  See the lustre ops manual on quotas.  Looks like like the amount granted is now exposed in the lfs quota output.

> On Jul 18, 2016, at 7:00 AM, Gibbins, Faye <Faye.Gibbins at cirrus.com> wrote:
> 
> Hi,
>  
> Thanks for replying. It’s good to know that my emails are getting through. J
>  
> H’m. 512Byte blocks you say? That’s confusing.
>  
> I know that my used quota is “88120” K, but this setting from /proc/fs/lustre/qmt/scratch-QMT0000/dt-0x0/glb-usr is 117440512 so that means that the units of this value would be 1332 Bytes surely.
>  
> Sorry I might be a little blonde here. How does 117440512 x 512Bytes = 86M?
>  
> Faye
>  
>  
>  
>  
>  
> From: Riccardo Veraldi [mailto:Riccardo.Veraldi at cnaf.infn.it] 
> Sent: 14 July 2016 01:39
> To: Gibbins, Faye <Faye.Gibbins at cirrus.com>
> Subject: Re: [lustre-discuss] Understanding quotas
>  
> 
> to answer you the mail passed through the list.
> I am not sure of the meaning of granted or I would have answered you. I am not using quotas.
> Anyway looks like is is really your used quota if we suppose that 117440512 are 512Bytes blocks
> this matches 86M
> 
> hope I have been helpful
> 
> 
> 
> On 11/07/16 07:57, Gibbins, Faye wrote:
> Hi,
>  
> Could someone please help me understand lustre quotas?
>  
> I’ve created a lustre filesystem called “scratch” using RHEL 7.2 and Lustre 2.8. When I run “lctl get_param qmt.scratch-QMT0000.dt-0x0.*” on the MDT I see for my ID the following:
>  
> - id:      20977
>   limits:  { hard:            600000000, soft:            500000000, granted:            117440512, time:                    0 }
>  
> Can someone tell me what the “granted” field is representing? I know it’s not my used quota, that’s only 86M and this value is nearer 112G.
>  
> Yours
> Faye Gibbins
>  
> Snr Systems Administrator, Unix Lead Architect (Software)
> Cirrus Logic | cirrus.com | +44 131 272 7398
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