add litleo docs

Author: stdweird

mkdocs/docs/HPC/only/gent/2025/litleo.md

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+# New Tier-2 cluster: `litleo`
+
+!!! warning
+    The `litleo` cluster is currently only available to members of the `gpilot` user group.
+
+
+In December 2024, a new cluster was added to the HPC-UGent Tier-2 infrastructure: `litleo`.
+
+If you have any questions on using `litleo`, you can [contact the {{ hpcteam }}]({{ hpc_support_url }}).
+
+For software installation requests, please use the [request form](https://www.ugent.be/hpc/en/support/software-installation-request).
+
+---
+
+## `litleo`: GPU cluster
+
+`litleo` is a new GPU cluster.
+
+It adds GPU capacity to existing clusters `joltik` and `accelgor`.
+
+It is only intended for ***single GPU*** compute use.
+
+This cluster consists of 8 workernodes, each with:
+
+* 1x 48 core AMD EPYC 9454P (Genoa @ 2.75 GHz) processor;
+* ~315 GiB of RAM memory;
+* 1.4TB local NVMe disk;
+* NDR-200 InfiniBand interconnect;
+* RHEL9 as operating system;
+* 2x NVIDIA H100 NVL (96GB VRAM)
+
+To start using this cluster from a terminal session, first run:
+```
+module swap cluster/.litleo
+```
+
+You can also start (interactive) sessions on `litleo` using the [HPC-UGent web portal](../../../web_portal.md).
+
+### Difference compared to `joltik` and `accelgor`.
+
+The main difference between `litleo` and the other GPU clusters is that *jobs are limited to using only one GPU per job*.
+The motivation comes from historical analysis of GPU usage on the `joltik` and `accelgor` clusters that show a very
+high utilisation of a single GPU per job; combined with cost of the GPUs in 2024. It allowed us get the most out of the
+budget.
+
+---
+
+## Shinx pilot phase (24/01/2025-01/03/2025)
+
+As usual with any pilot phase, you need to be member of the `gpilot` group, and to start using this cluster run:
+
+```
+module swap cluster/.litleo
+```
+
+Shortly after the Tier-2 maintenance in February 2025, the cluster will enter production, without any significant changes.