[ZFS] refquota is very slow !

[Ben RUBSON]

> On 07 Sep 2016, at 10:49, InterNetX - Juergen Gotteswinter <juergen.gotteswinter at internetx.com> wrote:
> 
> > Ben RUBSON <ben.rubson at gmail.com <mailto:ben.rubson at gmail.com>> hat am 7. September 2016 um 10:44 geschrieben:
> 
> > OK so here, filling remaining space with small blocks, there are of course more write operations than with big blocks, refquota overhead is then really impacting.
>  
> thats a general problem which you will also see on nearly full pools, try to no exceed 90% better 80-85%, its the nature of cow fs that this effect occours

But why quota is not impacted then ?
(ref)quota can be used to restrict users, so we should expect filling up to the (ref)quota.
Of course I agree that pool usage should not exceed 80%.

Thank you,

Ben