[Lustre-discuss] Per directory quota

[Kevin Van Maren]

On Jul 16, 2010, at 7:17 AM, "Christopher J.Walker" <C.J.Walker at qmul.ac.uk 
 > wrote:

> I know Lustre can do quotas per user, but can Lustre do quotas on a  
> per
> directory basis?

No, Lustre does not support directory (fileset) based quotas.


> I can't work out how to do this from the manual.
>
> To be more specific, the software we use[1] is written by people using
> GPFS and we'd like an equivalent to the GPFS command:
>
>    mmlsquota -j
>
> which AIUI finds out how much space is used under a directory.
>
> We could use
>
>    du --summarize mydirectory
>
> but for a directory containing a large number of files, this takes a
> long time - and is presumably not very  efficient. If there were an  
> "lfs
> du" it would presumably be more efficient, but even so, probably still
> resource intensive.

Without size-on-mds, either way would have to query both the mds and  
each OST to get the size info.  Not being that familiar with size-on- 
mds, it does seem likely that "du" would still have to query the OST  
for size info, even when "ls -l" does not.


> Am I missing something?
>
> [1] http://storm.forge.cnaf.infn.it/home
>
>
> Chris
>
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