= Grid_environment =
== How to Configure GridWay Based on DRBL ==

 * 1. Introduction [[BR]][[BR]]
  * GridWay is a Globus project, which provides scheduling functionalities similar to distributed resource management systems. GridWay interfaces to remote resources through Globus GRAM job manager. GridWay meta-scheduler integrates with the remote platforms and resource managers (Fork, PBS, SGE, LSF, LoadLeveler and Condor) compatible with Globus. 

 * 2. Configure GridWay on the DRBL server and clients [[BR]][[BR]]
  * Building and installing GridWay based on DRBL is very easy. You only install on the DRBL server by consulting [http://www.gridway.org/documentation/stable5.4/GWAdmin.pdf GridWay 5.4 System Administrator's Guide] and then configure the file:gwd.conf. To uncomment the last three lines and modify the server name.
{{{
#
# Example MAD Configuration for WS testbeds
#
IM_MAD = mds4:gw_im_mad_mds4_thr:-s drbl-srv.nchc.org.tw:gridftp:ws
EM_MAD = ws:gw_em_mad_ws::rsl2
TM_MAD = gridftp:gw_tm_mad_ftp:
}}}
  * IM_MADs is Information Manager Middleware Access Drivers. They are responsible for host discovery and monitoring. You can reference [http://www.gridway.org/documentation/stable5.4/GWAdmin.pdf GridWay 5.4 System Administrator's Guide 3.4. Information Driver Configuration] and [http://www.globus.org/toolkit/docs/latest-stable/admin/quickstart/#q-vo GT 4.2 Quickstart 3. VO-level services] to set up gwd. [[BR]][[BR]]
  * Finally, you can start the gwd daemon to perform GridWay successfully on the DRBL server and clients. [[BR]][[BR]]

 * 3. Troubleshooting [[BR]][[BR]]
  * (1) Could not create remote job directory (gsiftp://pc111.nchc.org.tw/~/.gw_gwuser_3/). [[BR]][[BR]]
   * Please check Gridftp. You can reference [http://www.globus.org/toolkit/docs/latest-stable/admin/quickstart/#q-gridftp Set up GridFTP].[[BR]][[BR]]
  * (2) Copy of file stdout.wrapper failed. Copy of file stderr.wrapper failed. Some output files were not copied, will NOT remove remote directory.[[BR]][[BR]]
   * At first, you should check if the GridWay administrator and all GridWay users are the same UNIX group. The permission of the job working directory($GW_JOB_HOME) should be written by the GridWay users. You can try "chmod g+w $GW_JOB_HOME".[[BR]][[BR]]
  * (3) Transfer MAD ($nice) not loaded for user gwuser[[BR]][[BR]]
   * The setting format of the configuration file (gwd.conf) in older versions and new version are different. [[BR]][[BR]]
{{{
older versions:
IM_MAD = <mad_name>:<path_to_mad>:[args]:[nice]:<tm_mad_name>:<em_mad_name>

nice: Integer value, that will be added to the rank calculated for the hosts managed by this Information Driver. 
      So you can prioritize, at a coarse level, hosts from different Information Drivers (or Grids).
}}}
{{{
new version (v5.4):
IM_MAD = <mad_name>:<path_to_mad>:[args]:<tm_mad_name>:<em_mad_name>
}}}
   * Now GridWay has remove [nice] field, so you may meet this error(Transfer MAD ($nice) not loaded for user gwuser) if you still set the [nice] field.


== References ==

 * [http://www.gridway.org/documentation/stable5.4/GWAdmin.pdf GridWay 5.4 System Administrator's Guide] 
 * [http://www.gridway.org/documentation/stable5.4/GWUser.pdf GridWay 5.4 User's Guide]