CSN4Cluster is the CSN4 centralized service for serial and parallel computation.
The cluster is installed, configured and maintained by the INFN-Pisa scientific computing center (led by A. Ciampa, + S. Arezzini, D. Fabiani, E. Mazzoni).
In order to use the cluster a INFN Certificate is needed as well as the subscription to the Theophys Virtual Organization ( detailed info )
The cluster access requires tool and knowledge well known in the INFN scientific community, by means of a User Interface (UI).
User Interfaces are availble in most of the INF sites. See: http://www.italiangrid.org/grid_operations/users/getting_started/UI
A specific UI will be installed in Pisa, including, besides the classic UI functions, a Web portal and a local access (via ssh and bsub) obtained with a special PAM module (INFN-AAI) which enables the possibility to access the UI using credential provided by the own user's site.
Worker Nodes (WN) are splitted into 2 partitions
WNs are shared among other VOs, but Theophys has higher priority, stated ba the Fairshare policy. The home directory is located on the node local disk.
The home is shared among WNs via GPFS (IP over IB). Actually only Theophys can submit to this queue.
10 TB splitted in 2 partitions: SRM (9 TB) + shared-home for parallel partition (1 TB)
Storage Resource Manager (SRM) is a Grid service interacting with the local storage systems and offering a Grid interface to the Grid infrastructure.
Files and directories are registered in a file catalog with a global namespace and are physically mapped on Storage Elements (SE) enabled for the specific VO.
or each IS a directory has been created in the File Catalog with nake like /grid/theophys/IS_<nome_Iniziativa_Specifica> (e.g. /grid/theophys/IS_AD31)
The SRM server in Pisa available for Theophys is gridsrm.pi.infn.it
For both partitions (serial and parallel) the user can save data directly (via Posix) on the SRM storage (to be verified).
Is the working directory for the parallel partition.
Serial jobs can be:
Parallel jobs can be
CSN4cluster usage can be monitored in real time using the LSF web interface : http://farmsmon.pi.infn.it/lsfmon/
Real time state of the queues (thempi, theoshort, theophys): http://www.fis.unipr.it/grid/tutorial/qstat.php
To request general support, concering information of general interest, please contact the users mailing-list theophys<at>lists.infn.it, which includes all the theophys users.
For support concerning scecifically the cluster hardware please contact the Pisa Pomputing Service: grid-prod<at>pi.infn.it
For policy or organizational problems please contact the CSN4Cluster Committee.
First CSN4cluster tutorial: Pisa, 7 and 8 April 2011