[Lustre-discuss] Quota performance

Mag Gam magawake at gmail.com
Sun Sep 28 08:40:56 PDT 2008


Thanks Andreas. We are planning to implement 250GB per user. Do you
think there will be a performance degration?


On Wed, Sep 24, 2008 at 4:11 PM, Andreas Dilger <adilger at sun.com> wrote:
> On Sep 24, 2008  06:11 -0400, Mag Gam wrote:
>> I was wondering if we should implement quotas for our students but is
>> there a downside such as performance? Previously, we implemented
>> quotes using vxfs and we noticed a significant performance hit and the
>> users were not happy. So, are there any downsides such as performance
>> loss when using quotas?
>
> There is defitely some performance overhead for quotas.  I don't have
> a number offhand.  The actual performance overhead depends on how hard
> you are pushing the network/filesystem already - if the IO rates aren't
> extreme then the network quota overhead probably isn't too bad.
>
> The quota for Lustre is designed to be high performance, with some
> sacrifice to the accuracy of the quota.  It isn't really designed to
> handle tiny quotas (like 50MB/user), if that is your target.
>
> Cheers, Andreas
> --
> Andreas Dilger
> Sr. Staff Engineer, Lustre Group
> Sun Microsystems of Canada, Inc.
>
>



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