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pages/merlin6/02 accessing-merlin6/accessing-slurm.md

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+---
+title: Accessing Slurm Cluster
+#tags:
+#keywords:
+last_updated: 13 June 2019
+#summary: ""
+sidebar: merlin6_sidebar
+permalink: /merlin6/slurm-access.html
+---
+
+## The Merlin6 Slurm batch system
+
+Clusters at PSI use the [Slurm Workload Manager](http://slurm.schedmd.com/) as the batch system technology for managing and scheduling jobs.
+Historically, *Merlin4* and *Merlin5* also used Slurm. In the same way, **Merlin6** has been also configured with this batch system.
+
+Slurm has been installed in a **multi-clustered** configuration, allowing to integrate multiple clusters in the same batch system.
+* Two different Slurm clusters exist: **merlin5** and **merlin6**.
+   * **merlin5** is a cluster with very old hardware (out-of-warranty).
+   * **merlin5** will exist as long as hardware incidents are soft and easy to repair/fix (i.e. hard disk replacement)
+   * **merlin6** is the default cluster when running Slurm commands (i.e. sinfo).
+
+Please follow the section **Merlin6 Slurm** for more details about configuration and job submission.
+
+### Merlin5 Access
+
+Keeping the **merlin5** cluster will allow running jobs in the old computing nodes until users have fully migrated their codes to the new cluster.
+
+From July 2019, **merlin6** becomes the **default cluster**. However, users can keep submitting to the old **merlin5** computing nodes by using 
+the option ``--cluster=merlin5`` and using the corresponding Slurm partition with ``--partition=merlin``. In example:
+
+```bash
+#SBATCH --clusters=merlin6
+```
+
+Example of how to run a simple command:
+
+```bash
+srun --clusters=merlin5 --partition=merlin hostname
+sbatch --clusters=merlin5 --partition=merlin myScript.batch
+```
+
+### Merlin6 Access
+
+In order to run jobs on the **Merlin6** cluster, you need to specify the following option in your batch scripts:
+
+```bash
+#SBATCH --clusters=merlin6
+```
+
+Example of how to run a simple command:
+
+```bash
+srun --clusters=merlin6 hostname
+sbatch --clusters=merlin6 myScript.batch
+```