[Pw_forum] nsfd

[Axel Kohlmeyer]

On Fri, 2009-07-17 at 19:00 -0700, Vo, Trinh (388C) wrote:
> Hi Paolo,
> 
> Thank you for your message.  
> 
> I understand now (hope it is correct).   Since we do not have Parallel
> File system on our cluster, all I/O via the network are used.  One
> option now is probably to write directly on local scratch disk to
> avoid NSF.  (I do not like this option very much).  In your opinion,
> is it possible to add the Parallel File System to an existing cluster?

yes. but it is an administrative nightmare. if you still 
confuse NFS with NSF, then you should not get into it.
regardless, using a local scratch is _much_ better and
needs to additional configuration.

cheers,
   axel.

>   
> 
> Trinh   
> 
> 
> On 7/17/09 2:32 AM, "Paolo Giannozzi" <giannozz at democritos.it> wrote:
> 
>         On Jul 17, 2009, at 2:47 , Vo, Trinh (388C) wrote:
>         > I usually saw lines of ‘nsfd’ appear on the ‘Command’
>         column.  What 
>         > ‘nsfd’ means?
>         >
>         "National Science Foundation daemon". It checks how you are
>         spending the
>         taxpayer's money, terminates your NSF grant if you are wasting
>         it :-)
>         
>         Seriously: it is "nfsd", it stands for "network file system
>         daemon", 
>         it means that
>         you are performing heavy I/O via the network, using the nfs
>         software.
>         This is something you should avoid as much as possible.
>         
>         Paolo
>         ---
>         Paolo Giannozzi, Dept of Physics, University of Udine
>         via delle Scienze 208, 33100 Udine, Italy
>         Phone +39-0432-558216, fax +39-0432-558222
>         
>         
>         
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-- 
=======================================================================
Axel Kohlmeyer   akohlmey at cmm.chem.upenn.edu   http://www.cmm.upenn.edu
   Center for Molecular Modeling   --   University of Pennsylvania
Department of Chemistry, 231 S.34th Street, Philadelphia, PA 19104-6323
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If you make something idiot-proof, the universe creates a better idiot.