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These are things one should read before using the cluster.
The cluster is currently composed of the following:
To access the cluster, you'll need an account on it. Contact Florido Paganelli or Pico to get access.
Every node of the cluster can access the shared storage. All users can access the shared storage, but can only access areas assigned to the working groups they belong. The shared storage is organized as follows:
Folder name | Folder location | Folder purpose | expected filesize | Description | Subfolders |
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users | /nfs/users | User homes | files smaller than 100MB each | This folder contains each user's private home folder. In this folder one should save his own code and eventually private data. Data that can also be used by others and the single files are bigger than 100MB should not be in this folder. Use the shared folder instead. | /<username> each user her own folder |
/npguests/<username> for Nuclear Physics guests |
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/ppguests/<username> for Particle Physics guests |
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software | /nfs/software | Application software | files smaller than 100MB each | This folder hosts software that is not accessible via cvmfs (see later). This usually includes user/project specific libraries and frameworks. | /np for Nuclear Physics users |
/pp for Particle Physics users |
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/tp for Theoretical Physics users |
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shared | /nfs/shared/ | Data that will stay for long term | Any file, especially big ones | This folder should be used for long-term stored data. For example, data needed for the whole duration of a phd project or shared among people belonging to the same research group. | /np for Nuclear Physics users |
/pp for Particle Physics users |
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/tp for Theoretical Physics users |
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scratch | /nfs/scratch/ | Data that will stay for short term | Any file, especially big ones | This folder should be used for short-term stored data. For example, data needed for a week long calculation or temporary calculation. This folder should be considered unreliable as its contents will be purged from time to time. The cleanup interval is yet to be decided | /np for Nuclear Physics users |
/pp for Particle Physics users |
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/tp for Theoretical Physics users |
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cvmfs | /cvmfs | Special folder containing CERN maintained software | user cannot write | This special folder is dedicated to software provided by CERN. This folder is read-only. Usually the content of this folder are managed via specific scripts that a user can run. If you need to add some software that you cannot find, contact the administrators. | /geant4.cern.ch for Nuclear Physics users |
/atlas.cern.ch for Particle Physics users |
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nodestmp | /nodestmp/nXY | Contains the /tmp folder of each node | any size. The disk is limited to 270GB | Files used by your code that you want to be directly on the node. It is recommended to copy the files there as this will speedup the calculation. | everyone |
Five main UNIX user groups are defined, as follows:
User group | Who belongs to it | Group hierarchy |
---|---|---|
npusers | Researchers belonging to Nuclear Physics | primary |
npguests | Visitors belonging to Nuclear Physics | primary |
ppusers | Researchers belonging to Particle Physics | primary |
ppguests | Visitors belonging to Particle Physics | primary |
tpusers | Researchers belonging to Theoretical Physics | primary |
clusterusers | All users accessing the cluster | secondary for npusers, ppusers and tpusers |
Group hierarchy tells how your files are created. Whenever you create a file, its default ownership will be: