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Durham University

COSMA

COSMA facilities

COSMA7

COSMA7

COSMA is comprised of COSMA5, COSMA6 and COSMA7, along with storage and support hardware (including tape drives for archival).

Storage includes:

  • /cosma5 - 2.4PB
  • /cosma6 - 2.5PB
  • /cosma7 - 2.1PB
  • /snap7 - 346TB for fast temporary storage (e.g. checkpointing)
  • /cosma/home - 37TB for user homespace (10GB each)
  • /cosma/local - 37TB for program/module storage

Users have access to /cosma/home/PROJECT/USERNAME, and one or more of /cosmaN/data/PROJECT/USERNAME.

Scratch space

COSMA7 contains the /snap7/ fast I/O storage space, which offers an achievable 180GB/s bandwidth (187GB/s theoretical). At installation, this was the fastest storage in Europe.

To make the most of alloted time on COSMA, researchers often pause their jobs e.g. every 12-24 hours, and create checkpoints which capture all the data in memory. Using the new COSMA7 storage, these checkpoints are 18 times faster than on COSMA6. Therefore, if a checkpoint for a 5 month simulation takes three hours on COSMA6, made every 12 hours, researchers will lose 1.8 million core hours (13% of available time) on a 4096 core job. On COSMA7, it will take only 10 minutes to create a checkpoint, and so only 0.2% of available time is lost.

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