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TB-SUPPORT  May 2006

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Subject:

Re: shared experiment area load

From:

Steve Traylen <[log in to unmask]>

Reply-To:

Testbed Support for GridPP member institutes <[log in to unmask]>

Date:

Wed, 24 May 2006 16:58:24 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (170 lines)

On Wed, May 24, 2006 at 09:57:29AM +0100 or thereabouts, Alessandra Forti wrote:
> I was wondering can you ask if ricardo is using
> 
> voms-proxy-init -voms lhcb:Role=Admin
> 
> or something like that?
> 
> It is possible that he is starting jobs with different roles proxies 
> this is might be he is mapped differently on different systems.


Looking at 

https://lcg-voms.cern.ch:8443/voms/lhcb/webui/admin/users/list?rolename=Role%3Dlcgadmin&groupname=%2Flhcb

Ricardo is in the /lhcb/Role=lcgadmin.

This is configured in out mkgridmap so that the gmf is populated with
this list and so Ricardo does not use a voms proxy he will be mapped to
sgm allways.

You can check someones proxy on your batch system by running qstat -f <jobid> on the CE to 
find 

X509_USER_PROXY=/home/lhcbsgm/.globus/.gass_cache/local/md5/9e/9b57a46
    e100edd5d9939a1a6a9af40/md5/f6/8865ed8caee346e27adf8c6f949b23/data


# voms-proxy-info -file /home/lhcbsgm/.globus/.gass_cache/local/md5/9e/9b57a46e100edd5d9939a1a6a9af40/md5/f6/8865ed8caee346e27adf8c6f949b23/data
subject   : /C=ES/O=DATAGRID-ES/O=UB/CN=Ricardo Graciani/CN=proxy/CN=proxy/CN=limited proxy
issuer    : /C=ES/O=DATAGRID-ES/O=UB/CN=Ricardo Graciani/CN=proxy/CN=proxy
identity  : /C=ES/O=DATAGRID-ES/O=UB/CN=Ricardo Graciani/CN=proxy/CN=proxy
type      : limited proxy
strength  : 512 bits
path      : /home/lhcbsgm/.globus/.gass_cache/local/md5/9e/9b57a46e100edd5d9939a1a6a9af40/md5/f6/8865ed8caee346e27adf8c6f949b23/data


so it is not a voms proxy. 

Now LHCb have recently reorganised their groups and roles as almost defined in their 
CIC VOMS card and I think they are now expecting that 

/lhcb/sgm

https://lcg-voms.cern.ch:8443/voms/lhcb/webui/admin/users/list?groupname=%2Flhcb%2Fsgm

be mapped to the SGM user so all the sites are currently configured wrong against
LHCb's latest schema.

But then this group still contains Ricard so it won't actually help.

I guess that  the VOMS groups are becoming more populated since people
can select which group they  run under so they might as well be in all them. The result
of this though is that generation of the grid-mapfile becomes not as planned.

But it is problably true as Alessandra says that Ricardo using voms-proxy-init 
and not selecting his sgm group for proxy would probably correct things.

 Steve






> 
> cheers
> alessandra
> 
> Alessandra Forti wrote:
> >It is extracted from voms.
> >
> >Gordon, JC (John) wrote:
> >>Nick and Philippe of LHCb tell me Ricardo is in the lhcb sgm group in
> >>VOMS but he should currently be running tests, not production. It sounds
> >>like the gmf generation is not consistent across sites.
> >>I have asked Ricardo what he thinks should be happening. Then I'll raise
> >>a ticket (or ask Olivier to do so).
> >>
> >>Does anyone know how the sgm in the gmf should be defined today? Is it
> >>extracted from VOMS? Or defined in YAIM?
> >>
> >>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 17:35
> >>>To: [log in to unmask]
> >>>Subject: Re: shared experiment area load
> >>>
> >>>Gordon, JC (John) wrote:
> >>>>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?
> >>>When checking the gridmapfile I can find only 3 sgm users.
> >>>Alex could you tell us when you saw a lot of lhcb sgm jobs ? When I 
> >>>look now i only see normal lhcb
> >>>
> >>>
> >>>Olivier.
> >>>>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                     -
> >>>>>
> >>>
> >>>-- 
> >>>- O. van der Aa - Imperial College London -
> >>>-       LT2 Technical Coordinator         -
> >>>- tel: +442075947810, +442071005426       -
> >>>- SIP: [log in to unmask]              -
> >>>- fax: +442078238830                      -
> >>>- http://surl.se/agtu                     -
> >>>
> >
> 
> -- 
> *******************************************
> * Dr Alessandra Forti			  *
> * Technical Coordinator - NorthGrid Tier2 *
> * http://www.hep.man.ac.uk/u/aforti	  *
> *******************************************

-- 
Steve Traylen
[log in to unmask]
http://www.gridpp.ac.uk/

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