Euler
This page describes the hardware of the different generations (IVII) of Euler. For information on how to use the cluster, please check the tutorials page.
Contents
Introduction
Euler stands for Erweiterbarer, Umweltfreundlicher, Leistungsfähiger ETHRechner. It is an evolution of the Brutus concept. Euler also incorporates new ideas from the Academic Compute Cloud project in 2012–2013 as well as the Calculus prototype in 2013.
Euler has been regularly expanded since its conception in 2013. The first phase — Euler I — was purchased at the end of 2013 and was in operation from 2014 to 2018. The second phase — Euler II — was purchased at the end of 2014 and was in operation from 2015 tol 2020. Euler III was purchased at the end of 2016 and was in operation from 2017 to 2022. Euler IV was purchased at the end of 2017 and was in operation from 2018 to 2022. Euler V, which replaced Euler I, was purchased in the fall of 2018 and was in operation until July 2023. Euler VI was purchased at the end of 2019 and is in operation since the beginning of 2020. Euler VII has been purchased in two phases, the first one is operational since January 2021 and the second one since January 2022. Euler VIII was installed at the end of 2022 and has been in operation since the beginning of 2023. Euler IX was purchased at the end of 2023 and will be operational in January 2024.
Specifications
Euler I
Euler I (20142018) contained 448 compute nodes — HewlettPackard BL460c Gen8 —, each equipped with:
 Two 12core Intel Xeon E52697v2 processors (2.7 GHz nominal, 3.0–3.5 GHz peak)
 Between 64 and 256 GB of DDR3 memory clocked at 1866 MHz (64 × 256 GB; 32 × 128 GB; 352 × 64 GB)
All compute nodes of Euler I were decommissioned in August 2018 to make room for Euler V.
Euler II
Euler II (20152020) contained 768 compute nodes of a newer generation — BL460c Gen9 —, each equipped with:
 Two 12core Intel Xeon E52680v3 processors (2.53.3 GHz)
 Between 64 and 512 GB of DDR4 memory clocked at 2133 MHz (32 × 512 GB; 32 × 256 GB; 32 × 128 GB; 672 × 64 GB)
Euler II also contained 4 very large memory nodes — HewlettPackard DL580 Gen9 —, each equipped with:
 Four 16core Intel Xeon E78867v3 processors (2.5 GHz)
 3072 GB of DDR4 memory clocked at 2133 MHz
Euler II was decommissioned in July 2020 to make room for new GPU nodes.
Euler III
Euler III (20162022) contained 1215 compute nodes — HewlettPackard m710x —, each equipped with:
 A quadcore Intel Xeon E31585Lv5 processor (3.03.7 GHz)
 32 GB of DDR4 memory clocked at 2133 MHz
 Local scratch: 211,293.0 MB
All these nodes were connected to the rest of the cluster via 10G/40G Ethernet.
Euler III was decommissioned in May 2022 to make room for new GPU nodes.
Euler IV
Euler IV (20172022) contained 288 highperformance nodes — HewlettPackard XL230k Gen10 —, each equipped with:
 Two 18core Intel Xeon Gold 6150 processors (2.73.7 GHz)
 192 GB of DDR4 memory clocked at 2666 MHz
 Local scratch: 348,582.0 MB (a few nodes have even 1,874,012.0 MB)
All these nodes were connected together via a new 100 Gb/s InfiniBand EDR network.
Euler IV was decommissioned in November 2022 to make room for Euler VIII.
Euler V
Euler V (20182023) contained 352 compute nodes — HewlettPackard BL460c Gen10 —, each equipped with:
 Two 12core Intel Xeon Gold 5118 processors (2.3 GHz nominal, 3.2 GHz peak)
 96 GB of DDR4 memory clocked at 2400 MHz
 Local scratch: 348,582.0 MB
Euler V was decommissioned in July 2023 to make room for new GPU nodes.
Euler VI
Euler VI contains 216 compute nodes from Swiss company Dalco AG, each equipped with:
 Two 64core AMD EPYC 7742 processors (2.25 GHz nominal, 3.4 GHz peak)
 512 GB of DDR4 memory clocked at 3200 MHz
 Local scratch: 920,618.0 MB
All these nodes are connected together via a dedicated 100 Gb/s InfiniBand HDR network.
Euler VII — phase 1
The first phase of Euler VII contains 292 compute nodes — HPE ProLiant XL225n Gen10 Plus —, each equipped with:
 Two 64core AMD EPYC 7H12 processors (2.6 GHz nominal, 3.3 GHz peak)
 256 GB of DDR4 memory clocked at 3200 MHz
All these nodes are connected together via a dedicated 100 Gb/s InfiniBand HDR network.
Euler VII — phase 2
The 2nd phase of Euler VII contains 248 compute nodes — HPE ProLiant XL225n Gen10 Plus —, each equipped with:
 Two 64core AMD EPYC 7763 processors (2.45 GHz nominal, 3.5 GHz peak)
 256 GB of DDR4 memory clocked at 3200 MHz
All these nodes share the same network as Euler VII phase 1.
Euler VIII
Euler VIII contains 192 compute nodes from Swiss company Dalco AG, each equipped with:
 Two 64core AMD EPYC 7742 processors (2.25 GHz nominal, 3.4 GHz peak)
 512 GB of DDR4 memory clocked at 3200 MHz
 Local scratch: 920,618.0 MB
All these nodes are connected to the cluster's 100 Gb/s Ethernet network.
Euler IX
Euler VIII contains 192 compute nodes from Swiss company Dalco AG, each equipped with:
 Two 96core AMD EPYC 9654 processors (2.4 GHz nominal, 3.7 GHz peak)
 384 GB of DDR5 memory clocked at 4800 MHz
 Local scratch: 1.8 TB
All these nodes are connected to the cluster's 100 Gb/s Ethernet network and will be connected to a dedicated 100 Gb/s InfiniBand HDR network later this year.
GPU nodes
Euler contains dozens of GPU nodes equipped with different types of GPUs:

9 nodes with 8 x Nvidia GTX 1080 (formerly in Leonhard Open)decommissioned in 2023 
47 nodes with 8 x Nvidia GTX 1080 Ti (formerly in Leonhard Open)decommissioned in 20232024  4 nodes with 8 x Nvidia Tesla V100 (including some formerly in Leonhard Open)
 93 nodes with 8 x Nvidia RTX 2080 Ti (including some formerly in Leonhard Open)
 16 nodes with 8 x Nvidia Titan RTX
 20 nodes with 8 x Nvidia Quadro RTX 6000
 33 nodes with 8 x Nvidia RTX 3090
 3 nodes with 8 x Nvidia Tesla A100 (40 GB PCIe)
 3 nodes with 10 x Nvidia Tesla A100 (80 GB PCIe)
 2 nodes with 8 x Nvidia Tesla A100 (80 GB PCIe)
 40 nodes with 8 x Nvidia RTX 4090
GPU nodes are not linked to a specific Euler expansion cycle but are purchased according to shareholders' needs. Their specifications (CPU, RAM, disk, networks) vary considerably, even between nodes equipped with similar GPUs.
Storage
Euler contains two types of storage system:
 An enterpriseclass NAS system (NetApp FAS 9000 & AFF A800) for longterm storage, such as home directories, applications, virtual machines, project data, etc.
 A highperformance Lustre parallel file system (DDN ES14KX) for short and mediumterm storage, such as scratch and work file systems
Home directories and other critical data are backed up daily; all other data (except scratch) are backed up at least once per week for disaster recovery.
Networks
Euler contains multiple networks:
 A common 100/25/10 Gb/s Ethernet network for data transfer between the storage systems and the cluster's compute and login nodes
 Three separate 56 Gb/s InfiniBand FDR networks for data transfer between the compute nodes themselves (e.g. MPI)
 A 100 Gb/s InfiniBand EDR network for data transfer within Euler IV (MPI) and between Euler IV and the new Lustre highperformance storage system
 A 200/100 Gb/s InfiniBand HDR network for data transfer within Euler VI–VII with 100 Gb/s from compute nodes to switches and multiple 200 Gb/s links between switches
Summary
Clusters  #nodes  #cores/node  CPUs  Clock speed  Memory  Mem clock speed  Local scratch [MB]  Network 

Euler VI  216  128  AMD EPYC 7742  2.25 GHz nominal, 3.4 GHz peak  512 GB  3200 MHz  920,618.0  100 Gb/s InfiniBand HDR 
Euler VII p1  292  128  AMD EPYC 7H12  2.6 GHz nominal, 3.3 GHz peak  256 GB  3200 MHz  348,582.0  100 Gb/s InfiniBand HDR 
Euler VII p2  248  128  AMD EPYC 7763  2.45 GHz nominal, 3.5 GHz peak  256 GB  3200 MHz  348,582.0  100 Gb/s InfiniBand HDR 
Euler VIII  192  128  AMD EPYC 7742  2.25 GHz nominal, 3.4 GHz peak  512 GB  3200 MHz  920,618.0  100 Gb/s Ethernet 
Euler IX  192  192  AMD EPYC 9654  2.4 GHz nominal, 3.7 GHz peak  384 GB  4800 MHz  1,800,000  100 Gb/s Ethernet 
Service description
The official service description and the current price list are available on the IT service catalogue.