---
title: Introduction
#tags:
#keywords:
last_updated: 28 June 2019
#summary: "Merlin 6 cluster overview"
sidebar: merlin6_sidebar
permalink: /merlin6/cluster-introduction.html
---

## Slurm clusters

* The new Slurm CPU cluster is called [**`merlin6`**](/merlin6/cluster-introduction.html).
* The new Slurm GPU cluster is called [**`gmerlin6`**](/gmerlin6/cluster-introduction.html)
* The old Slurm *merlin* cluster is still active and best effort support is provided. 
The cluster, was renamed as [**merlin5**](/merlin5/cluster-introduction.html).

From July 2019, **`merlin6`** becomes the **default Slurm cluster** and any job submitted from the login node will be submitted to that cluster if not . 
* Users can keep submitting to the old *`merlin5`* computing nodes by using the option ``--cluster=merlin5``.
* Users submitting to the **`gmerlin6`** GPU cluster need to specify the option ``--cluster=gmerlin6``.

### Slurm 'merlin6'

**CPU nodes** are configured in a **Slurm** cluster, called **`merlin6`**, and
this is the _**default Slurm cluster**_. Hence, by default, if no Slurm cluster is 
specified (with the `--cluster` option), this will be the cluster to which the jobs
will be sent.