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HLRN is operating at each site 3 central storage systems:

• HOME: IBM Spectrum Scale file system with 340 TiByte capacity, which exports via NFS
  • $HOME directories /home/${USER}/
  • Centrally managed software and the module system in /sw
• WORK: Lustre parallel file system with 8 PiByte capacity containing
  • $WORK directories /scratch/usr/${USER}/
  • $TMPDIR directories /scratch/tmp/${USER}/
  • project data directories /scratch/projects/<projectID>/ (not yet available)
• PERM: Tape archive with multiple petabyte capacity with additional harddisk caches

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The Lustre based work filesystem /scratch is the main work filesystem for the HLRN clusters. Each user can distribute data to different directories.

• WORK directory = /scratch/usr/${USER}
  • large intput/output data for production jobs
  • the intention is to use this data for the user only
• project directories /scratch/projects/<projectID>
  • large intput/output data for production jobs
  • the intention is to share this data within the project group
• TMPDIR directory = /scratch/tmp/${USER}
  • applications and compilers store data temporarily

We provide no backup of this filesystem. The storage system of Emmy provides around 65GiB/s streaming bandwith and Lise around 85GiB/s in normal operation. The storage system is harddisk based (with solidstate disks vor metadata), so the best performance can be reached with sequential IO of large files that is aligned to the fullstripe size of the underlying RAID6 (Emmy 1MiB, Lise 16MiB).

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