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