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### Introduction
Merlin6 is a the official PSI Local HPC cluster for development and
mission-critical applications that has been built in 2019. It replaces
Merlin6 was a the official PSI Local HPC cluster for development and
mission-critical applications that has been built in 2019. It replaced
the Merlin5 cluster.
Merlin6 is designed to be extensible, so is technically possible to add
Merlin6 was designed to be extensible, so was technically possible to add
more compute nodes and cluster storage without significant increase of
the costs of the manpower and the operations.
Merlin6 is mostly based on **CPU** resources, but also contains a small amount
Merlin6 was mostly based on **CPU** resources, but also contained a small amount
of **GPU**-based resources which are mostly used by the BIO experiments.
### Slurm 'gmerlin6'
THe **GPU nodes** have a dedicated **Slurm** cluster, called **`gmerli6`**.
THe **GPU nodes** have a dedicated **Slurm** cluster, called **`gmerlin6`**.
This cluster contains the same shared storage resources (`/data/user`, `/data/project`, `/shared-scracth`, `/afs`, `/psi/home`)
which are present in the other Merlin Slurm clusters (`merlin5`,`merlin6`). The Slurm `gmerlin6` cluster is maintainted
which are present in the Merlin6 Slurm CPU cluster. The Slurm `gmerlin6` cluster is maintainted
independently to ease access for the users and keep independent user accounting.
## Merlin6 Architecture
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![Merlin6 Architecture Diagram](../images/merlinschema3.png)
### Merlin5 + Merlin6 Slurm Cluster Architecture Design
### Merlin6 Slurm Cluster Architecture Design
The following image shows the Slurm architecture design for the Merlin5 & Merlin6 clusters:
The following image shows the Slurm architecture design for the Merlin6 clusters:
![Merlin6 Slurm Architecture Design](../images/merlin-slurm-architecture.png)

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On 2018, for the common good, BIO decided to open the cluster to the Merlin users and make it widely accessible for the PSI scientists.
The below table summarizes the hardware setup for the Merlin6 GPU computing nodes:
The below table summarizes the hardware setup for the old Merlin6 GPU computing nodes:
<table>
<thead>
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</tbody>
</table>
### Gwendolen
Currently only Gwendolen is available on `gmerlin6`.
### Login Nodes
The login nodes are part of the **[Merlin6](../merlin6/introduction.md)** HPC cluster,