...

A general recommendation for network filesystems is to keep the number of metadata operations for open and closing files, as well as checks for file existence or changes as low as possible. These operations often become a bottleneck for the IO of your job and on large clusters can easily overload the file servers.

Separate GPU-scratch for grete Partitions on Emmy

On Emmy, glogin9.hlrn.de and the Grete nodes (ggpu[101-136,201-202]) have their own separate /scratch  that is different from the one on the other frontend and compute nodes. On these nodes, you can still access the /scratch of the other frontend and compute nodes at /scratch-emmy .

PERM, tape archive

The magnetic tape archive provides additional storage for inactive data to free up space on the WORK or HOME filesystem. It is directly accessible on the login nodes..

• directory /perm/${USER}
• secure file system location on magnetic tapes
• no solution for long-term data archiving
• no guarantee for 10 years according to rules for good scientific practice

...

For reasons of efficiency and performance, small files and/or complex directory structures should not be transferred to the archive directly. Please aggregate your data to compressed tarballs or other archive containers with a maximum size of 5,5TiB before copying your data to the archive.