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The table below gives you an overview of the available options for storage. Note that, except for the user home directory, data storage is allocated per project.

Quota Max files Expandable Backup Retention
20 GB 100k No Yes User lifetime
50 GB 100k Yes
No Project lifetime
50 TB 2000k Yes
No 90 days
2 TB 1000k Yes
No 30 days

When a storage space is marked as expandable, it means that you can request more space if needed.

Each user has a home directory ($HOME) that can contain up to 20 GB of data. It is intended to store user configuration files and personal data. The user home directory is purged once the user account expires.

Is intended to share data amongst the members of a project. You can see this workspace as the project home directory. Typically, this space can be used to share applications and libraries compiled for the project. The project persistent storage is located at /project/project_<project-number>. The project persistent directory is purged once the project expires.

Lustre file systems intended as temporary storage for input, output or checkpoint data of your application. LUMI offers 2 types of scratch storage solution: LUMI-P with spinning disks and LUMI-F based on flash storage.

LUMI-F unavailable until summer 2022

To prepare for the installation of LUMI-G, LUMI-F has been removed from the system and will be available again after LUMI-G installation is completed.

Data rentention policies not active

Scratch automatic cleaning is not active at the moment. Please remove the files that are no longer needed by your project on a regular basis if you don't want to run out of TB-hours.

Using compute nodes /tmp

The /tmp directory on the compute nodes resides in memory and is included in the job memory request. This means that your job can run of memory if you write to much data to /tmp


Storage is billed by volume as well as time. The billing units are TB-hours. For the regular scratch file system, 1TB that stays for 1 hour on the filesystem, consumes 1TB-hour. For the flash based filesytem 1TB for 1 hour consumes 10 TB-hours.

About the number of files quota

For reasons related to performance, we are particularly attentive to the number of files present on the parallel filesystem. A lot of small files negatively impact all users by stressing the filesystem metadata servers. Therefore, any requests to increase the number of files will be evaluated carefully by the Support Team and must be fully justified.

Requests that will be rejected include:

  • You are using Conda: you should use the container wrapper tool.
  • The compilation of your application is generating too many files for your home or project directory: you should compile your application from the scratch and then install it in your home or project directory. Exception can be made if you are developing an application on LUMI and you want to keep the source and object files in the long term.

In general, applications that generate a lot of small files per processes are not well suited for LUMI. If you are the developer of such application, you should consider tools like HDF5 or SIONlib.

Object Storage

Not available yet

Quota Max buckets Objects/bucket Backup Retention
Object Storage 10 TB 1000 500K No Project lifetime
+ xx days