Olivier, I am sitting next to Nick Brook and he says that lhcb
production jobs should not run as sgm. Is this happening at other sites?
Can you tell me the DN of the user being mapped to sgm, if that doesn't
break your data security policy:-) Nick thinks the gridmapfile
generation may not be correct.
John
> -----Original Message-----
> From: Testbed Support for GridPP member institutes
> [mailto:[log in to unmask]] On Behalf Of Olivier van der Aa
> Sent: 23 May 2006 15:49
> To: [log in to unmask]
> Subject: shared experiment area load
>
> Dear All,
>
> At QMUL we have a load problem with the experimental shared area.
> The farm is running around 900 jobs and the nfs server serving the
> experimental area is overloaded.
>
> The result of that is that lhcb jobs sits for a long time on the wn
> waiting for data (mainly libraries).
>
> We would like to know how this is solved at ral, manchester where the
> size is similar. We where thinking of setting up a set of pbs
> slots for
> the sgm to have rw access. The other nodes would just have a
> copy on the
> local disk or access through several nfs servers.
>
> I think the problem with the small set of wn having rw access is that
> lhcb is sending a lot of jobs via one user who is sgm. Most of those
> jobs do not write to the experimental software area but they
> would stack
> to wait for the wn to be freed.
>
> We are keen to have your experience on that topic.
>
> Cheers, Olivier.
>
> --
> - O. van der Aa - Imperial College London -
> - LT2 Technical Coordinator -
> - tel: +442075947810, +442071005426 -
> - SIP: [log in to unmask] -
> - fax: +442078238830 -
> - http://surl.se/agtu -
>
|