Lustre file system Hebe

Lustre

Overview

Access	lustre.hpc.gsi.de
Path	/lustre
Capacity	32.6 PiB
Aggr. Bandwidth	675 Gb/s

Usage Statistics

Lustre Throughput Monitoring

on 2021-05-17

Data safety

Unified Lustre mount point

• /lustre is the path to access the Lustre file system(s).
• The paths /lustre/nyx and /lustre/hebe remain as a symbolic links for backwards compatibility
• The underlying Lustre file system for the path /lustre as of December 2019 is the Hebe Lustre file system.

Quotas

Two distinct quotas limit the usage on Hebe:

1. a limit on the maximum occupied space
2. a limit on the number of files

Storage space quota

The storage space is limited on a per-group basis. When a group exceeds its assigned quota, warning mails are sent to the associated group coordinators.

If you are a member of multiple groups the group id (gid) information of the files control for which group they are accounted for. The gid info can be changed with the chgrp command.

The following command will assign the group mygroup to all your files beneath /lustre/mygroup/mydir

» chgrp -Rc mygroup /lustre/mygroup/mydir

Group quotas are negotiated between the group coordinators and IT in the course of the Computing-Users-Meeting.

Quota on the number of files

In addition to the storage quota we limit the number of files (inodes). This limit is implemented as the number of files has a signifikant impact on the overall performance of the Lustre filesystem.

Each file system object (directory, file) uses at least one inode. Large files and directories may require multiple inodes.

The limitation is implementet per-user. Warning mails are sent out when the limit is exceeded. The default limit is 300 000 inodes.

Individual limits may be increased if a conclusive rationale is provided eg. for project accounts. To apply for a raise send an email to lustre-service@gsi.de.