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# Nodes configuration # Nodes configuration
The configuration has a frontal node, named `atlas`, and 5 compute nodes `atlas[1-5]`. The configuration has a frontal node, named `atlas`, and 2 compute nodes `atlas[5-6]`.
## Frontal node `atlas` ## Frontal node `atlas`
* 64 cores on 4 sockets (AMD Opteron 6386 SE 2.8 Ghz) * 64 cores on 4 sockets (AMD Opteron 6386 SE 2.8 Ghz)
* 512 GB of RAM * 512 GB of RAM
* 2.4 TB of storage on SSD (directory: `/ssd`) * 2.4 TB of storage on SSD (directory: `/ssd`)
* 70 TB for data storage (10'000 rpm HDD) (directory: `/data`) * 70 TB for data storage (10'000 rpm HDD) (directory: `/data`)
* NFS mount to access laboratory data (such as `/home`) * NFS mount to access laboratory data (such as `/home`)
## Compute nodes `atlas[1-6]` ## Compute nodes `atlas[5-6]`
* 24 cores on 2 sockets (Intel Xeon E5-2680 v3 2.50GHz (`atlas[1-4]`) or v4 @ 2.40GHz (`atlas[5-6]`)), hyperthreaded * 24 cores on 2 sockets (v4 @ 2.40GHz (`atlas[5-6]`)), hyperthreaded
* 256 GB of RAM * 256 GB of RAM
* 1 TB scratch dir `/scratch` * 1 TB scratch dir `/scratch`
* NFS mount to access frontal node data: `/ssd` and `/data` * NFS mount to access frontal node data: `/ssd` and `/data`
* NFS mount to access laboratory data (such as `/home`) * NFS mount to access laboratory data (such as `/home`)
`atlas4` node is equipped with 2 NVIDIA K80 GPGPU cards. Everything is interconnected with both 10Gb Ethernet cards and 40Gb Infiniband cards.
The workload manager is [slurm](https://computing.llnl.gov/linux/slurm/).
Everything is interconnected with both 10Gb Ethernet cards and 40Gb Infiniband cards.
The workload manager is [slurm](https://computing.llnl.gov/linux/slurm/). # Storage
# Storage From every node, you have access to several storages.
From every node, you have access to several storages. #### Your home directory `/home/u*/<username>`
#### Your home directory `/home/u*/<username>` This directory is meant only to store important files and have to be kept to a minimal size.
The storage server is mounted via NFS so I/O performance is low.
This directory is meant only to store important files and have to be kept to a minimal size. Files are backed up on IRMA facility.
The storage server is mounted via NFS so I/O performance is low.
Files are backed up on IRMA facility. #### The `/data/<username>` directory
#### The `/data/<username>` directory If this directory does not exist, you must create one, so you don't mix your files with other users. This partition has a size of 50 TB, so you can store big data, like simulation results, compilation-related files and libraries ...
If this directory does not exist, you must create one, so you don't mix your files with other users. This partition has a size of 50 TB, so you can store big data, like simulation results, compilation-related files and libraries ... #### The `/ssd/<username>` directory
#### The `/ssd/<username>` directory
If this directory does not exist, you must create one, so you don't mix your files with other users. This partition has a size of 2 TB and is put on SSDs for increased access speed. You can use it to store medium-sized data. If this directory does not exist, you must create one, so you don't mix your files with other users. This partition has a size of 2 TB and is put on SSDs for increased access speed. You can use it to store medium-sized data.
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