Irregular low performance of Hydra’s new storage#
Updated on 21/04/2022
16:00 We have pinned this issue down to a specific configuration of the
login nodes. Today, April 21st, at 21:00 (CEST) we will apply an urgent fix
to the login nodes that will increase the filesystem perfomance of
VSC_DATA back to normal levels. The login nodes will be
rebooted during the process and they will be unavailable for 10 min.
The new storage of Hydra that serves
VSC_DATA is showing
very low performance under certain circumstances. This issue is mostly
affecting file operations with many small files, whereas data transfers of big
files show good transfer rates. Moreover, not all nodes are equally affected.
For instance, the login nodes show worse performance than compute nodes.
We are currently investigating the cause of this issue. In the meantime, users
having trouble to carry out their workflows in Hydra can use
The scratch storage is as fast as before the move of the cluster.
We will update this post with any new information as the investigation goes on.
If you have any questions or a specific workflow that is much slower than before, please contact VUB-HPC Support.