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---
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title: Hardware And Software Description
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#tags:
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#keywords:
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last_updated: 09 April 2021
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#summary: ""
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sidebar: merlin6_sidebar
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permalink: /merlin5/hardware-and-software.html
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---
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# Hardware And Software Description
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## Hardware
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### Computing Nodes
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Merlin5 is built from recycled nodes, and hardware will be decomissioned as soon as it fails (due to expired warranty and age of the cluster).
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* Merlin5 is based on the [**HPE c7000 Enclosure**](https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=c04128339) solution, with 16 x [**HPE ProLiant BL460c Gen8**](https://h20195.www2.hpe.com/v2/getdocument.aspx?docname=c04123239) nodes per chassis.
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* Connectivity is based on Infiniband **ConnectX-3 QDR-40Gbps**
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* 16 internal ports for intra chassis communication
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* 2 connected external ports for inter chassis communication and storage access.
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* 16 internal ports for intra chassis communication
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* 2 connected external ports for inter chassis communication and storage access.
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The below table summarizes the hardware setup for the Merlin5 computing nodes:
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In Merlin5, we try to keep software stack coherency with the main cluster [Merlin6](../merlin6/index.md).
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Due to this, Merlin5 runs:
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* [**RedHat Enterprise Linux 7**](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.9_release_notes/index)
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* [**Slurm**](https://slurm.schedmd.com/), we usually try to keep it up to date with the most recent versions.
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* [**GPFS v5**](https://www.ibm.com/support/knowledgecenter/en/STXKQY_5.0.2/ibmspectrumscale502_welcome.html)
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