ENEAGRID Primer

This page contains a short introduction to the use of ENEAGRID resources.

A prerequisite for using an HPC infrastructure is a basic knowledge of Linux shell commands. Several guides are available on the web, one example is The Linux Command Line, Internet Edition by William Shotts   

ENEAGRID is the infrastructure providing the access to the computational resources of ENEA ICT Division
More information about ENEAGRID can be found at this page.
The main ENEAGRID computational resources are the CRESCO Clusters. Here only some basic information are provided:



How to connect to ENEAGRID


A connection to ENEAGRID front-ends can be established in two ways:


  • Using SSH to one of the ENEAGRID front-end machines:
    for example cresco-in.portici.enea.it or cresco-in.frascati.enea.it

    • SSH client availability:
    • ssh is available on every UNIX/Linux system while Windows ssh clients are included in commercial packages as Exceed.
    • Free Windows client are also available on the Web:
      1. The PUTTY suite at the putty download Page  which includes a GUI ssh client and the line command utilities psftp, pscp.
      2. MobaXterm provides X sessions as also sftp/scp services
      3. GUI clients for sftp and scp are also available: 

AAfter the first connection, it is mandatory to change the password that has been provided at the moment of the account creation and the system forces the required  change.

Subsequent password changes are performed using the line command kpasswd userid from a terminal window.
ENEAGRID password can also be changed using the site  ENEAGRID Password Changer


File space and user HOME directory


All users on all ENEAGRID computing nodes share the same file space which is based on the AFS/OpenAFS distributed file system.
User HOME directory is /afs/enea.it/user/site/userid.
The same directory is also available at /afs/enea.it/user/first_userid_character/userid.

https://www.eneagrid.enea.it/Resources_en/CRESCO_documents
The default structure of the user HOME contains the following directories:
  •   ~/private          - the directory is readable only for the user
  •   ~/public           - the directory is readable by any user
  •   ~/public_html - the directory is readable by any user and its content is published on the web at the address: http://www.afs.enea.it/userid
  •   ~/rem                - the directory contains the mount points for volumes remote sites; a request for AFS volumes on remote sites must be done to the AFS administrators
  •   ~/PFS                - the directory contains the links to the available Parallel File Systems. Information about Parallel File System can be found at: Parallel File Systems in ENEAGRID
The accessibility of the AFS file space is controlled by AFS ACL (Access Control List).

The Access Control List of a directory can be displayed by the command:
  • fs la path_of_the_directory   (fs help provides all the information about fs command )
Informations about OpenAFS can be found at the  AFS page for ENEAGRID

The ENEAGRID file space can also be accessed directly from an User Workstation:
see Workstation Access to ENEAGRID Data Space


How to submit a job to ENEAGRID


Jobs in ENEAGRID clusters must be submitted with different job management systems  (LSF or SLURM), depending on the cluster.
See the documentation https://www.eneagrid.enea.it/Resources_en/CRESCO_documents
for the information specific of the choosen cluster.


Support and Information Tools


User support can be required using the ENEAGRID ticket system: http://gridticket.enea.it
All the ENEAGRID must be subscribed to the mailing list griduser@enea.it.
The mailing list is used by ENEAGRID administrators to contact the users.


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