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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.

Billing

Terminology

  • Billing Unit (BU): A unit used for billing at CSC - each resource consumes a given amount of BUs per hour.
  • Cloud Billing Unit (Cloud BU): Billing Units assigned to Cloud services resource usage.
  • CSC computing project: A placeholder for the user's resource information, including the number of Cloud BUs and the CSC services available for use.
  • Rahti project: A Kubernetes namespace with additional annotations.

Billing model

The Cloud Billing usage of a given CSC project is calculated by scraping the usage data from all Rahti projects associated with that CSC project. These calculations are based on:

  • Pod's CPU cores,
  • Pod's memory,
  • Persistent volumes.

If the current usage is lower than the minimum requested resource, the requested resource is used for the calculations.

The rate at which Cloud Billing Units are consumed depends on the size of the resources as shown in the table:

Resource Cloud Billing Units
Pod core hour 1.05
Pod RAM GB hour 1.6
Storage TiB hour 3.6

Info

Currently, Rahti does not bill for the stored images.

Example calculation

You create a pod with the following specs for resources.requests:

...
  - resources:
      requests:
        cpu: '1'
        memory: 512MiB
...

and the current real usage is:

  • 0.5 cores
  • 1 GiB RAM
  • You also create a persistent volume of size 10 GiB and attach it to the pod.

The cost in Cloud BUs can be calculated as follows:

The core usage is 0.5 cores and the request is 1 core. According to the Cloud BU consumption rate, 1 > 0.5, so, 1.05 BU/h is used.

The memory usage is 1 GiB and the request is 512 MiB. The same goes for the memory: 1 GiB > 512 MiB, so 1.6 BU/h is used.

And for the storage 0.036 BU/h is used.

BU calculation

* Cloud BU: Cloud Billing Unit

Billing Unit calculator

For an estimate of the Billing Units the services you plan on using will consume, please refer to the Billing Unit calculator below. The Billing Unit calculator can also be found at MyCSC.