General FAQ

How Do I Apply for User Account?

e-INFRA CZ account is for users affiliated with an academic institution from the Czech Republic. To request an account, go to: https://signup.e-infra.cz/fed/registrar/?vo=IT4Innovations.

IT4I account is for users who are not eligible for an e-INFRA CZ account, contact the IT4I support. and provide information specified here: https://docs.it4i.cz/en/docs/general/get-access/account/obtaining-login-credentials.

Why is a Signed Email Required When Creating an Account?

A signed email is used to verify the identity of the user for security reasons. When using a personal Actalis certificate, you must also provide additional identification documents (e.g., passport, personal ID). Based on the verified (signed) email, a password is generated, encrypted, and sent to the user. For more information, see: https://docs.it4i.cz/en/docs/general/get-access/account/obtaining-login-credentials.

How Do I Apply for a Project?

The computational resources of IT4I are allocated via allocation mechanisms. For testing and benchmarking purposes, choose the Fast Track Access option. For more information, see https://www.it4i.cz/en/for-users/computing-resources-allocation.

I Am a PI of a Project. How Can I Add Users to My Project?

All users must have an active IT4I account. Once their account is created, you can add them to your project using their login name: https://docs.it4i.cz/en/docs/general/get-project/applying-for-resources#authorize-collaborators-for-your-project. If you have any issues, please contact user support.

How Can I Be Added to a Project?

To be added to a project, you need to know the project ID and the name of the project PI. Please contact the PI of the project and ask them to authorize you according to this guide: https://docs.it4i.cz/en/docs/general/get-project/applying-for-resources#authorize-collaborators-for-your-project.

Where Can I Get Information About My Project (End Date, Amount of Hours, Usage)?

Use it4ifree or it4iusage command on cluster; for more information, see: https://docs.it4i.cz/en/docs/general/tools/cli-client-tools. Alternatively, you can list project resource usage data from SCS portal available at https://scs.it4i.cz.

I Am Getting the SSH Key Error: Permission Denied (publickey).

We accept only ED25519 keys for logging into our systems. Please generate a new, supported SSH key.

How Do I Change My Password or SSH Key?

If you are using an e-INFRA CZ account (associated with a Czech academic institution), see: https://docs.it4i.cz/en/docs/general/profile-management/einfracz-profile;

in other cases (logins typically start with it4i-XXX), see: https://docs.it4i.cz/en/docs/general/profile-management/it4i-profile#change-ssh-key.

How Do I Run My Job?

To run a job, you have to allocate computational resources via the Slurm job workload manager. For more information, see: https://docs.it4i.cz/en/docs/general/run-jobs/resource_allocation_and_job_execution.

Where Can I Find a List of Available Applications and Software Modules Available?

A complete overview of available modules can be found here: https://docs.it4i.cz/en/docs/software/modules/modules-matrix.

I Would Like to Use a Different Module, Application or Version, What Should I Do?

Please contact user support and follow the guidelines provided here: https://docs.it4i.cz/en/docs/software/modules/new-software.

How Can I Check the Current Load on the Clusters?

After logging in to your IT4I account, you can use the RS Web interfaces:

Barbora: https://extranet.it4i.cz/rsweb/barbora
Karolina: https://extranet.it4i.cz/rsweb/karolina

Or you can use Grafana Dashboards:

How Are Resources Allocated and What Job Queues Can I Use?

Resources are allocated in a fair-share fashion and depend on the queue used for the job and the resources available to your project. For more information, see: https://docs.it4i.cz/en/docs/general/run-jobs/resource-allocation/resources-allocation-policy.

How Do I Reserve Resources

You can request a reservation of a specific number, range, or type of computational resources at support[at]it4i.cz. Note that unspent reserved node-hours count towards the total computational resources used.

Is It Possible to Extend a Job?

Yes, please send a request for a job extension to support[at]it4i.cz. Do not forget to include the job ID, the number of extra hours needed, and a short explanation of why the extension is needed.

How Can I Request Additional Storage Space for /home, /projectX, or /scratch?

Please contact user support with the following information in your request:

a. which storage location do you want to extend, b. additional size requested, c. brief reason for the request.

I Am Getting Error: Batch Job Submission Failed: Invalid Account or Account/Partition Combination Specified

Possible causes include:

Invalid account (i.e. project) was specified in job submission. Check the account and project ID.
User does not have access to the account/project. Check https://scs.it4i.cz.
Specified account/project does not have access to the partition. Check https://scs.it4i.cz.
Access to the partition was retracted due to the project’s allocation exhaustion.

Check the info about the project via the it4ifree command or visit https://scs.it4i.cz.

What is the Correct Way to Cite IT4I (Lumi, Karolina, Barbora, etc.) in a Scientific Publication?

Mandatory acknowledgement phrase are the following:

CZ: Tato práce byla podpořena Ministerstvem školství, mládeže a tělovýchovy České republiky prostřednictvím e-INFRA CZ (ID:90254).
EN: This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic through the e-INFRA CZ (ID:90254).

For more information, see https://www.it4i.cz/en/for-users/users-duties.

I Have Resources Allocated on LUMI, but I Am not Sure Where to Find the LUMI Documentation and Support?

The LUMI documentation is available here: https://docs.lumi-supercomputer.eu/. The link to the LUMI support team is here: https://lumi-supercomputer.eu/user-support/need-help/.

My Question Was Not Answered in the FAQ. Where Can Find Help?

Contact user support or use the support portal for help regarding the cluster technology at IT4Innovations. For communication, use the Czech, Slovak, or English language. You can check the status of your ticket at https://support.it4i.cz/.

The IT4Innovations support team will use best efforts to resolve requests within thirty days. To facilitate the process, please include the following:

Basic information

Problem description – what exactly happened, what the service does / does not do;
Time when the problem occurred;
Affected service / system – which cluster (e.g. Karolina, Barbora, DGX, CS);
Your public IP address;
Your VPN address (if you are connected via VPN);
Your login (username);
Project ID / project number;
Logs and error messages;
Log of the affected service (relevant log excerpt or attachment);
Error message – ideally an exact copy-paste or a screenshot.

If the issue is related to a job

Job script (e.g. sbatch file);
Job ID (or IDs) of the problematic job(s);
Error log (e.g. slurm-XXXXXX.out / slurm-XXXXXX.err).

Finally, please include any other useful details that might help us diagnose and resolve the issue (recent configuration changes, code updates, specific modules you are using, etc.).

General FAQ

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