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Warning!

Puhti and Mahti are being decommissioned in stages, and their storage areas will become fully unavailable from 15 October 2026. Clean up unnecessary files and move any data you need to keep by 31 August 2026. See the Roihu data migration guide for instructions on transferring your data to Roihu.

Puhti computing services have been decommissioned and no new jobs are accepted or executed on its compute nodes. Puhti login nodes and storage services are planned to remain available until 15 October 2026.

How fast is the Pouta network?

The network is a mix of 40 Gb/s and 10 Gb/s Ethernet. Machines launched using HPC flavors will have 40 Gb/s network access while standard flavors will have 10 Gb/s. For more information, see the chapter about virtual machine flavors: Virtual machine flavors and quotas

Some limitations are imposed by virtualisation:

  • For intra node and external connectivity some overhead is introduced because of virtualization. This will impact latency and bandwidth, but we have no benchmark data to share at this time.
  • Applications sensitive to network latency may perform significantly worse than using a cluster (like Puhti) natively.
  • Overhead is introduced by the necessity to use Ethernet for virtual machine connectivity and compatibility.