Hopper has nodes connected to the internal Gemini network that provide functions that support the compute nodes. These include job launch nodes (MOM nodes), Lustre router nodes, DVS nodes, networking nodes and nodes that support shared and dynamic libraries.
| MOM Nodes (On Compute Blades) |
- manage and launch parallel applications
- execute job scripts
- 24 nodes
- 32 GB of memory per node
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| Lustre Router Nodes (Service Nodes) |
- route IO data to the /scratch file systems
- distributed throughout the Gemini network
- 48 nodes
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| DVS Server Nodes (Service Nodes) |
- route IO data to the $HOME, $PROJECT and $GSCRATCH partitions in the NERSC Global File System
- distributed throughout the internal Gemini network
- 32 nodes
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| Shared-root DVS Server Nodes (on compute blades) |
- projects (almost) full-Linux image onto compute nodes, which enables shared library and dynamically compiled applications to run
- 16 nodes
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Data Mover Nodes
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- handle HPSS data traffic
- 4 nodes
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| Networking Nodes |
- handle network traffic between the outside world land nodes on the internal Gemini network
- 4 nodes
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