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Migrating your account to Cirrus EX4000

Important

This information was last updated on 20 Nov 2025

This section covers the following questions:

  • When will I be able to access Cirrus EX4000?
  • Has my project has been migrated to Cirrus EX4000?
  • How much resource will my project have on Cirrus EX4000?
  • How do I set up an account on Cirrus EX4000?
  • How do I log into Cirrus EX4000 for the first time?

Tip

If you need help or have questions on this migration process, please contact the Cirrus service desk

When will I be able to access Cirrus EX4000?

We are planning a preview period in week beginning 24 Nov 2025 when all users and projects migrating to Cirrus EX4000 will have access to test use of the system in an uncharged mode.

Full service will start on Monday 8 December 2025. At this point jobs will be charged against budgets.

Has my project been migrated to Cirrus EX4000?

If you have an active Cirrus CPU allocation beyond 31 Dec 2025 then your project will very likely be migrated to Cirrus EX4000. If your project is migrated to Cirrus EX4000 then it will have the same project code as it had on old Cirrus.

Checking if your project has been migrated

How you check if your project has been migrated depends on whether you are a project PI/manager or user:

  • If you are a PI/manager: If your project has been migrated to Cirrus EX4000 then you will be able to see this on the Project page in SAFE. In particular, you will have a button labelled "Manage Group Time Allocations for CirrusEX (Allocations on Cirrus (2025 refresh))" in the "Time Budgets" section on the project page.
  • If you are a user: If your project has been migrated to Cirrus EX4000 then you will see an project "CirrusEX" coreh allocation on your login account page in SAFE.

How much resource will my project have on Cirrus EX4000?

As on the old Cirrus CPU partition, the unit of allocation on Cirrus EX4000 is core hours (coreh). Your initial allocations on Cirrus EX4000 will have the same number of coreh as old Cirrus allocations.

How do I set up an Cirrus EX4000 account?

How you setup your account depends on whether you have an existing Cirrus account in the project you are using for access or if you need a new account.

Migrate an existing Cirrus account to Cirrus EX4000

  1. Login to EPCC SAFE
  2. Use the "Login accounts" menu to select your existing Cirrus account (this will be in the format username@eidf)
  3. At the bottom of the account page, click the "Add Machine" button
  4. Select "Cirrus: Cirrus 2025 refresh" from the dropdown list
  5. Click "Join"

You should now be able to login to Cirrus EX4000 using the existing credentials associated with this account.

Create a new account on Cirrus EX4000

Use the standard account creation process in SAFE and select "Cirrus: Cirrus 2025 refresh" for the machine to request an account on.

You will need to setup credentials (MFA/TOTP token and SSH key) in the usual way to be able to login to Cirrus EX4000.

How do I log into Cirrus EX4000 for the first time?

You will log into Cirrus EX4000 in the same way as you logged in to old Cirrus using SSH to access login.cirrus.ac.uk using an SSH key pair and TOTP. Your SSH key and TOTP will be the same as it was on old Cirrus. If you have issues, the Cirrus documentation covers logging from a variety of operating systems along with troubleshooting tips:

If you are still having issues after following the documentation and troubleshooting tips, please contact the Cirrus service desk