Hans-Nikolai Viessmann
e7bfce70a4
* added back the HPCE logo to landing page * activated the sticky tabs navigation feature (so navigation bar stays visible) * added edit buttons to content (so users can _maybe_ help us in keeping our docs up to date)
59 lines
3.0 KiB
Markdown
59 lines
3.0 KiB
Markdown
# Introduction
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{ width="400px" }
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/// caption
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_Within his lair, the wizard ever strives for the perfection of his art._
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///
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## About Merlin7
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PSI's Merlin7 cluster is run on top of an IaaS (Infrastructure as a Service) *vCluster* on the [CSCS Alps infrastructure](https://www.cscs.ch/computers/alps). It is fully integrated with the PSI service landscape was designed to provide the same end user experience as its PSI-local predecessor clusters.
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Merlin7 has been in **production** since beginning of June 2025.
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All PSI users can request access to Merlin7, please go to the [Requesting Merlin Accounts](requesting-accounts.md) page and complete the steps given there.
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In case you identify errors or missing information, please provide feedback through [merlin-admins mailing list](mailto:merlin-admins@lists.psi.ch) mailing list or [submit a ticket using the PSI service portal](https://psi.service-now.com/psisp).
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## Infrastructure
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### Hardware
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The Merlin7 cluster contains the following node specification:
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| Node | #N | CPU | RAM | GPU | #GPUs |
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| ----: | -- | --- | --- | ----: | ---: |
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| Login | 2 | 2 AMD EPYC 7742 (64 Cores 2.25GHz) | 512GB | | |
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| CPU | 77 | 2 AMD EPYC 7742 (64 Cores 2.25GHz) | 512GB | | |
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| GPU A100 | 8 | 2 AMD EPYC 7713 (64 Cores 3.2GHz) | 512GB | A100 80GB | 4 |
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| GPU GH | 5 | NVIDIA ARM Grace Neoverse v2 (144 Cores 3.1GHz) | 864GB (Unified) | GH200 120GB | 4 |
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### Network
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The Merlin7 cluster builds on top of HPE/Cray technologies, including a high-performance network fabric called Slingshot. This network fabric is able
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to provide up to 200 Gbit/s throughput between nodes. Further information on Slignshot can be found on at [HPE](https://www.hpe.com/psnow/doc/PSN1012904596HREN).
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Through software interfaces like [libFabric](https://ofiwg.github.io/libfabric/) (which available on Merlin7), application can leverage the network seamlessly.
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### Storage
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Unlike previous iteration of the Merlin HPC clusters, Merlin7 _does not_ have any local storage. Instead storage for the entire cluster is provided through
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a dedicated storage appliance from HPE/Cray called [ClusterStor](https://www.hpe.com/psnow/doc/PSN1012842049INEN.pdf).
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The appliance is built of several storage servers:
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* 2 management nodes
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* 2 MDS servers, 12 drives per server, 2.9TiB (Raid10)
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* 8 OSS-D servers, 106 drives per server, 14.5 T.B HDDs (Gridraid / Raid6)
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* 4 OSS-F servers, 12 drives per server 7TiB SSDs (Raid10)
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With effective storage capacity of:
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* 10 PB HDD
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* value visible on linux: HDD 9302.4 TiB
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* 162 TB SSD
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* value visible on linux: SSD 151.6 TiB
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* 23.6 TiB on Metadata
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The storage is directly connected to the cluster (and each individual node) through the Slingshot NIC.
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