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'''WRF4G Grid Resources''' currently are defined by [[http://www.gridway.org/doku.php?id=documentation:release_5.8:cg |GridWay Drivers]], therefore if you want to access to Grid Resources, you must configure '''gwd.conf'''. This file is located under $GW_LOCATION/etc.

== WRF4G !GridWay Drivers Available ==

The following drivers are included in WRF4G:
 * Information Driver:
    * BDII (gw_im_mad_mds2_glue-bdii)

 * Transfer Driver:
   * Dummy Transfer driver (gw_tm_mad_dummy)

 * Execution Drivers:
   * GRAM2 (gw_em_mad_gram2)
   * CREAM (gw_em_mad_cream)

== Required Middleware ==

The following middlewares should be installed to use the corresponding drivers:

* Globus Toolkit 2 and above, and gLite 3.1 (GRAM2-based)
* gLite UI 3.2 (CREAM-based)


== Configuration options Divers ==

Next steps describe an specific configuration of the drivers for '''Gisela Infrastructure'''. However, the  examples below can be applied to any VO.


In file "$GW_LOCATION/etc/gwd.conf":

{{{
#!sh
# Example GT2
IM_MAD = gt2:gw_im_mad_mds2_glue-bdii:-l etc/gt2.list -q (GlueCEAccessControlBaseRule=VO\:prod.vo.eu-eela.eu) -s bdii.eela.ufrj.br:tm_gt2:em_gt2
EM_MAD = em_gt2:gw_em_mad_gram2::rsl_nsh
TM_MAD = tm_gt2:gw_tm_mad_dummy:-u gsiftp\://ui01.macc.unican.es

# Example CREAM
IM_MAD = cream:gw_im_mad_mds2_glue-bdii:-l etc/cream.list -q (GlueCEAccessControlBaseRule=VO\:prod.vo.eu-eela.eu) -s bdii.eela.ufrj.br:tm_cream:em_cream
EM_MAD = em_cream:gw_em_mad_cream::jdl
TM_MAD = tm_cream:gw_tm_mad_dummy:-g
}}}
There are three options for the configuration of the IM MAD:
* -l: host list file to be used.
 * Example of gt2.list for Gisela Infrastructure:
{{{
#!sh
[user@ui~]$ lcg-infosites --vo prod.vo.eu-eela.eu ce | awk 'NR>2 {print $6}'|grep jobmanager |awk -F ":" '{print $1}' | uniq
ce01-tic.ciemat.es
ce01.unlp.edu.ar
ce.labmc.inf.utfsm.cl
tochtli.nucleares.unam.mx
grid012.ct.infn.it
ce01.eela.if.ufrj.br
ce.cp.di.uminho.pt
ce01.macc.unican.es
ce01.up.pt
grid001.fe.up.pt
}}}
 * Example of cream.list for Gisela Infrastructure:
{{{
#!sh
[user@ui~]$ lcg-infosites --vo prod.vo.eu-eela.eu ce | awk 'NR>2 {print $6}'|grep cream |awk -F ":" '{print $1}' | uniq
gantt.cefet-rj.br
ce206.cern.ch
ce204.cern.ch
ce205.cern.ch
ce207.cern.ch
ce208.cern.ch
tochtli64.nucleares.unam.mx
ce02.eela.if.ufrj.br
cream01.cecalc.ula.ve
ce.egee.di.uminho.pt
cale.uniandes.edu.co
grid001.fc.up.pt
}}}

* -q: it is possible to configure a !GridWay instance to only use queues authorized to your VO by filtering them.
* -s: information server in a hierarchical configuration.
{{{
#!sh
IM_MAD = gt2:gw_im_mad_mds2_glue-bdii:-l etc/gt2.list -q (GlueCEAccessControlBaseRule=VO\:prod.vo.eu-eela.eu) -s bdii.eela.ufrj.br:tm_gt2:em_gt2
}}}

There are two options for the configuration of the TM MAD:
* -g: starts a GASS server.      
* -u: specifies the URL of a GridFTP server running in the client. For example:
{{{
#!sh
TM_MAD = tm_gt2:gw_tm_mad_dummy:-u gsiftp\://ui01.macc.unican.es
}}}

== Running environment ==

After configuring a experiment in experiment.wrf4g, we can choose the running environment we want for it (data repositories, number of cores to use, requirements that Computing Resources must fulfill,...). This configuration is done in resources.wrf4g.

If resources.wrf4g is not present in the folder from where the experiment is submitted, the system will use the default one located in $WRF4G_LOCATION/etc/. 

{{{
WRF4G_BASEPATH="gsiftp://$WRF4G_LOCATION/repository/output" 
WRF4G_DOMAINPATH="gsiftp://$WRF4G_LOCATION/repository/domains"
WRF4G_INPUT="gsiftp://$WRF4G_LOCATION/repository/input"
WRF4G_APPS="gsiftp://$WRF4G_LOCATION/repository/apps"
}}}

== Accessing the VOMS servers ==
To use the Grid Resources, the user should iniatilize the proxy through voms server:
{{{
#!sh
[user@ui~]$ voms-proxy-init --voms prod.vo.eu-eela.eu
Cannot find file or dir: /oceano/gmeteo/users/carlos/.glite/vomses
Enter GRID pass phrase:
Your identity: /DC=es/DC=irisgrid/O=unican/CN=josecarlos.blanco
Creating temporary proxy ........................................ Done
Contacting  voms.eela.ufrj.br:15003 [/C=BR/O=ICPEDU/O=UFF BrGrid CA/O=UFRJ/OU=IF/CN=host/voms.eela.ufrj.br] "prod.vo.eu-eela.eu" Done
Creating proxy ................................... Done
Your proxy is valid until Tue Aug 23 22:15:06 2011
}}}