Disk quotas

Disk quotas #

Individual disk usage quotas are enforced on /home/users/ and /home/data. You can use the quota command to query your current usage and quota statistics:

quota --human-readable --show-mntpoint --hide-device

The output will look like this:

Disk quotas for user danilov (uid 1002): 
     Filesystem   space   quota   limit   grace   files   quota   limit   grace
    /home/users 101275M    100G    110G            382k   1000k   1100k        
     /home/data  22634M   1024G   1024G           33435  10000k  10000k        

There are two types of limits:

  • the total size of used disk space (space);
  • the total number of files (files).

The command quota will show you the current usage for space/files, as well as the value of quota and the maximum limit. Zeros in both quota and limit fields are used as unlimited values. The operating system will not allow the user to exceed the limit value, returning the error Disk quota exceeded. However, the user may exceed the quota value for a limited time (7 days). In this case the remaining time will be displayed in the field grace.

Disk quotas for user danilov (uid 1002): 
     Filesystem   space   quota   limit   grace   files   quota   limit   grace
    /home/users    101G*   100G    110G   6days    382k   1000k   1100k        
     /home/data  22634M   1024G   1024G           33435  10000k  10000k        

Add the following lines to your ~/.bashrc file in order to check quota limits at login time:

# check only local quotas and print in human-readable format if exceeded
command -v quota >/dev/null 2>&1 && { quota -lq --show-mntpoint --hide-device 2>/dev/null || quota -ls --show-mntpoint --hide-device; }

Disk /home/users #

Starting from April, 2022 the following quotas are enforced in user home directories under /home/users:

  • maximum file size – 100 GB,
  • maximum number of files – 1 million.

Individual quotas are defined for users with usage exceeding 50 GB or 500k files in March, 2022: extra 50 GB and 500k files are added to the actual usage. Individual quotas are subject to gradual decrease over time.

Disk /home/data #

The following quotas are enforced in directories under /home/data:

  • maximum file size – 1 TB,
  • maximum number of files – 10 million.

Disk /home/events #

Individual quotas are used for temporary events. Group quotas could be used as well, check quota -g.

Unlimited disks #

Starting from April, 2022 the following disks are available for users:

Path Size Availability Notes
/home/data4t 4 TB all nodes transferred from /data4t, will be removed in February, 2025
/home/data14t 14 TB all nodes transferred from /data14t, will be removed in February, 2025
/home/biomath 30 TB all nodes transferred from /data90t/biomath, data for biomathematics research groups
/home/geosci 280 TB all nodes transferred from /data90t/geosci, data for geoscience research groups