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File Systems

One global Lustre file system with a total storage capacity of 54 PetaBytes is available on Mistral.

Mistral file system

Mistral users have access to three different storage spaces: HOME, WORK, and SCRATCH. Each storage area has a specific purpose as described below.

  • HOME is the file system where users' sessions start upon login to Mistral. It is backed up and should be used to store shell setup files, source codes, scripts, and important files.
  • WORK is a project space available through the allocations process and shared between all users of a project. It provides disk space for large amounts of data, but it is not backed up. It can be used e.g. for writing raw model output and processing of data that is accessible to all project members.
  • SCRATCH is provided for temporary storage and processing of large data. To prevent the file system from overflowing, old data is automatically deleted. The granted retention period is 14 days.


The Lustre file system is available on all nodes (login and compute), so you can use them during interactive sessions and in batch jobs. The table below provides further details on different storage spaces.


Path /pf/[a,b,g,k,m,u]/<userid> /work/<project> /scratch/[a,b,g,k,m,u]/<userid>
Environment variable $HOME
  • Globally accessible Lustre file system
  • Assigned to user account
  • Storage of personal settings files, source codes and scripts
  • Globally accessible Lustre file system
  • Assigned to project account
  • Interim storage of output from running applications and frequently accessed data
  • Globally accessible Lustre file system
  • Assigned to user account
  • Temporary storage and processing of large data sets

Quota 24 GB according to annual
project allocation
15 TB
Backup YES, please contact DKRZ-Beratung to restore files deleted by mistake NO NO
Automatic data deletion NO NO YES
Data life time until user account deletion 1 month after project expiration 14 days since the last file access

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