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docs/merlin5/cluster-introduction.md
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---
title: Cluster 'merlin5'
#tags:
#keywords:
last_updated: 07 April 2021
#summary: "Merlin 5 cluster overview"
sidebar: merlin6_sidebar
permalink: /merlin5/cluster-introduction.html
---
# Merlin 5 Cluster
## Slurm 'merlin5' cluster
## Slurm cluster
**Merlin5** was the old official PSI Local HPC cluster for development and
mission-critical applications which was built in 2016-2017. It was an
extension of the Merlin4 cluster and built from existing hardware due
to a lack of central investment on Local HPC Resources. **Merlin5** was
then replaced by the **[Merlin6](../merlin6/cluster-introduction.md)** cluster in 2019,
with an important central investment of ~1,5M CHF. **Merlin5** was mostly
based on CPU resources, but also contained a small amount of GPU-based
extension of the Merlin4 cluster and built from existing hardware due
to a lack of central investment on Local HPC Resources. **Merlin5** was
then replaced by the **[Merlin6](../merlin6/index.md)** cluster in 2019,
with an important central investment of ~1,5M CHF. **Merlin5** was mostly
based on CPU resources, but also contained a small amount of GPU-based
resources which were mostly used by the BIO experiments.
**Merlin5** has been kept as a **Local HPC [Slurm](https://slurm.schedmd.com/overview.html) cluster**,
called **`merlin5`**. In that way, the old CPU computing nodes are still available as extra computation resources,
and as an extension of the official production **`merlin6`** [Slurm](https://slurm.schedmd.com/overview.html) cluster.
The old Merlin5 _**login nodes**_, _**GPU nodes**_ and _**storage**_ were fully migrated to the **[Merlin6](../merlin6/index.md)**
cluster, which becomes the **main Local HPC Cluster**. Hence, **[Merlin6](/merlin6/index.html)**
The old Merlin5 _**login nodes**_, _**GPU nodes**_ and _**storage**_ were fully migrated to the **[Merlin6](../merlin6/index.md)**
cluster, which becomes the **main Local HPC Cluster**. Hence, **[Merlin6](../merlin6/index.md)**
contains the storage which is mounted on the different Merlin HPC [Slurm](https://slurm.schedmd.com/overview.html) Clusters (`merlin5`, `merlin6`, `gmerlin6`).
### Submitting jobs to 'merlin5'