Storage

The file systems used on MOGON are

• IBM’s GPFS / Spectrum Scale, which was historically the MOGON I file system. Nowadays, it is employed for the user homes.
• and Lustre, which is used on MOGON II and MOGON NHR.

Both are parallel file systems, meaning that the data is accessible on every client.

The HOME-Directory#

The HOME directory on MOGON for each user is a link to /gpfs/fs1/home/<username> visible as /home/<username>.

The home directory is intended for small scripts, configuration files, aggregated results, etc. It is not for heavy I/O , particularly not on MOGON II, as it is exposed via NFS to this cluster.

On the login nodes the home directory quota can be checked with this command:

mmlsquota --block-size auto -u $USER fs1:home | grep -v 'limits'

Project Directories on MOGON II#

The project directory on MOGON II currently resides under /lustre/miifs01/project/<projectname>.

The project directories (resp. their underlying file systems) are optimized for I/O on many big files. All non-volatile data relevant to the project can be put here.

Projects requiring an extension of the default memory quota can contact the HPC team to provide a plausible argument as well as the desired figure of disk space. Depending on the current usage and validity of the request the HPC team may grant additional quotas.

If logged in to MOGON II, the current project quota (frequently identical to group quota) and the occupied memory can be looked up with this Lustre command:

lfs quota -g <projectname> /lustre/miifs01/project/<projectname>/