https://docs.cluster.uni-hannover.de/ 2026-05-08T08:59:21+00:00 https://docs.cluster.uni-hannover.de/ https://docs.cluster.uni-hannover.de/lib/exe/fetch.php/wiki/logo.png text/html 2026-04-20T07:36:16+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/about_the_cluster_system?rev=1776670576&do=diff I am a new user - Quick Start ---------- Please note: If you have absolutely no time at all, read at least this page. Investing some time here will save you much time later. First, the basics: * In order to access and use the cluster, you need an account. Accounts are organized in text/html 2024-10-16T09:34:15+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/apptainer?rev=1729071255&do=diff Apptainer Containers (replaces Singularity) Apptainer will replace Singularity on the the LUH-Clusters. Currently you can use both commands apptainer and singularity because the last one is a symlink to apptainer. This may change in the future. Please note text/html 2026-04-21T08:59:04+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/citation?rev=1776761944&do=diff Citing the compute cluster LUH´s compute cluster is partly funded by the DFG as Major Research Instrumentation (Forschungsgroßgerät). In fact, several parts of the compute cluster have been funded independently in the past. The most recent addition is the compute cluster partition Amo. When publishing research that has been significantly helped by using compute cluster, we would like to politely ask for a reference also containing to the DFG funding, which is not part of the funding guidelines,… text/html 2021-12-09T15:31:49+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/cloud_storage_rclone?rev=1639063909&do=diff Transferring files from/to cloud storage ---------- This document walks through some of the basics of using the command line program Rclone allowing to synchronize files between the cluster (compute and login nodes) and external cloud storage systems. Rclone has a rich set of features and can be used with many different cloud systems including Dropbox, ownCloud, Google Drive, etc. However, here we will consider text/html 2026-04-20T07:41:36+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/cluster_faq?rev=1776670896&do=diff FAQ: Frequently asked questions ---------- Formal issues I forgot my password! → Go to your project management (usually that's the people of your own institute) who will help you with that. We can not and will not reset your password, that is entirely the project management's responsibility. text/html 2026-01-04T14:38:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/connecting_to_cluster?rev=1767537521&do=diff How to connect to the cluster ---------- You can only connect to the cluster from within the LUH network. If you want to connect from the “outside” (e.g. from Home), you'll have to establish a VPN connection to the university’s network first. See text/html 2022-01-08T10:39:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/handling_large_datasets?rev=1641638360&do=diff Handling large datasets within the cluster ---------- While working on the cluster, you may need to perform operations such as copy, delete, sync, find, etc. on a very large number of files or on files that are very large in size. While we do recommend to first have a look whether you can reduce the number of files you need to handle e.g. by packing them (because both the file system Lustre that is driving BIGWORK and the controllers of the disk drives have limits how many files they can handl… text/html 2026-03-30T17:49:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/how_to_get_support?rev=1774892990&do=diff Contact & Help ---------- Need help running your job on the cluster? Need a question answered about a particular tool or cluster resources? * Please contact the cluster team at <cluster-help@luis.uni-hannover.de> using the email address associated with your cluster account. * You can also call us on the phone +49 511 762 791000 (be aware, though, that some problems are complex and we sometimes need to look through logs and think about what we see, too). text/html 2026-02-16T16:35:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/modules_and_application_software?rev=1771259743&do=diff Modules & Application Software ---------- The number of software packages that are installed together with the operating system on cluster nodes is kept light on purpose. Additional packages and applications are provided by a module system, which enables you to easily customise your working environment on the cluster. This module system is called Lmod text/html 2022-06-13T10:01:51+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/remote_visualization?rev=1655114511&do=diff Remote visualization ---------- While the cluster is mainly designed to run batch jobs without user interaction, we realize that in some cases it is necessary to also interactively work on a node - for example when setting up a 3D-model that is too large to fit into your workstation's memory in a simulation software, or if you need to postprocess/filter large amounts of data that has been generated by a job in your BIGWORK directory. To facilitate that, we have installed a special node that ha… text/html 2026-05-04T09:29:48+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/slurm_usage_guide?rev=1777886988&do=diff SLURM usage guide ---------- If you are completely new to scientific computing, read this: Please keep in mind that simply throwing a serial program without provisions for parallelization at the cluster will not make it run faster. In fact, it will often run SLOWER, since cpu cores on machines specialized in scientific computing usually run at lower clock frequencies than workstation cpus. text/html 2026-02-09T18:00:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/storage_systems?rev=1770660010&do=diff File systems in the cluster ---------- As you may have guessed, there are several file systems serving the cluster. Each of these file systems has its own characteristics, making it the choice for a different workload. Under Unix/Linux, file systems are simply text/html 2024-04-26T17:22:44+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/transferring_data?rev=1714152164&do=diff File transfer to/from the cluster ---------- There is a special node dedicated to data transfer with the cluster system. Whenever you transfer data with the cluster system, please use this node: transfer.cluster.uni-hannover.de Please note: Use the dedicated transfer node for file transfers, because processes that use more than 30 minutes of cpu time on the login machines will be aborted by the system. Since ssh/scp use encryption, you may eventually use enough cpu time to get the transfe… text/html 2021-10-22T06:52:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/transferring_files_into_the_archive?rev=1634885560&do=diff Transferring data into the archive ---------- Please note: The archive is operated as part of the service Archivierung and thus not part of the cluster system. The archive can be used to store results and simulation data permanently. Each account has to be registered for archive use, before using it. This can be done on the text/html 2025-08-19T11:25:37+00:00 Anonymous (anonymous@undisclosed.example.com) https://docs.cluster.uni-hannover.de/doku.php/guide/when_your_work_is_done?rev=1755602737&do=diff When your work is done When you are done with your work on the cluster system and possibly leave the LUH, it would be nice if you did a few things before you go, to help others get a lightweight system that does not lug around old data: * clean up your directories: