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CVMFS at Glasgow

CVMFS is a network file system based on HTTP and optimized to deliver experiment software in a fast, scalable, and reliable way. It was originally developed as part of the CernVM project and has the following features:

  • Caching, Read-only
  • Based on very standard technologies - outgoing http, fuse...
  • Scales very easily with additional squid caches
  • File checksums (currently SHA1) are verified against a trusted catalog obtained over HTTPS
  • File based deduplication as a handy side effect of the signed file catalog
  • Uses fuse to mount a virtual filesystem (based on a signed-catalog downloaded form the server)
  • Performance is close to a locally installed sofwtare after initial cache population
  • Jobs run faster than with either NFS or AFS
  • Removes the need for local software install jobs at every site

(borrowed from the gridpp CVMFS page https://www.gridpp.ac.uk/wiki/RAL_Tier1_CVMFS)

CVMFS on batch and desktops

The CVMFS repositories are mounted under the /cvmfs directory. Currently the ams.cern.ch, atlas.cern.ch, atlas-condb.cern.ch, atlas-nightlies.cern.ch, cms.cern.ch, geant4.cern.ch, lhcb.cern.ch, na61.cern.ch and sft.cern.ch are repositories are available.

[~]$ ll /cvmfs
total 5
dr-xr-xr-x 2 root  root     0 Nov  8 13:28 ams.cern.ch
drwxrwxr-x 1 cvmfs cvmfs    0 Mar  5  2012 atlas.cern.ch
drwxr-xr-x 2 cvmfs cvmfs    0 Nov  8 13:28 atlas-condb.cern.ch
drwxr-xr-x 2 cvmfs cvmfs    0 Nov  8 13:28 atlas-nightlies.cern.ch
dr-xr-xr-x 2 root  root     0 Nov  8 13:28 cms.cern.ch
drwxr-xr-x 2 cvmfs cvmfs    0 Nov  8 13:28 geant4.cern.ch
dr-xr-xr-x 2 root  root     0 Nov  8 13:28 lhcb.cern.ch
dr-xr-xr-x 2 root  root     0 Nov  8 13:28 na61.cern.ch
dr-xr-xr-x 2 root  root     0 Nov  8 13:28 sft.cern.ch

-- AndrewPickford - 2013-11-11

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Topic revision: r1 - 2013-11-11 - AndrewPickford
 
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