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eth2rm - Man Page



Permits the generation of configuration files for FastFabric or resource managers from a topology xml file.

When using a topology spreadsheet and ethxlattopology to design and prepare for deployment verification of a fabric, eth2rm may be used to generate resource manager configuration from the planned cluster design. Using this approach will allow the resulting configuration files to be complete, even if some nodes in the fabric have not yet been installed or made operational. Alternatively, ethreport -o topology can be used to generate a topology XML file for input to eth2rm. In this case, only the currently present nodes will be included.

When working with SLURM, the eth2rm -o slurm option should typically be used. This option will generate a SLURM configuration file that lists the hosts directly connected to each switch in a syntax that can be used by SLURM's topology/tree plugin. It also generates a single "fake" switch shown as connecting all the other switches together. This approach allows for SLURM job placement to be improved while avoiding undo overhead in SLURM. This option also allows for topologies that are not a pure fat-tree.

When the configuration is a pure fat tree or oversubscribed fat tree, the eth2rm -o slurmfull option may be used to generate the full description of the fabric, including all intermediate and core switches in the fat tree topology. This option may permit better job placement optimization than the output from the eth2rm -o slurm option. However for larger fabrics, it may also increase the overhead within SLURM.


eth2rm [-v] [-q] -o  output [-g|-u|-t] [-F  point] [-p  prefix] [-s  suffix] topology_input



Produces full help text.


Specifies verbose output.


Disables progress reports.

-o/--output output

Specifies the output type:

slurm SLURM tree nodes. Supports a variety of topologies.

slurmfull SLURM fat tree nodes and ISLs. Only supports pure trees.

hosts FastFabric hosts file omitting this host


Specifies to output switch GUIDs instead of names.


Changes spaces in switch names to underscores.


Truncates switch names at first space.

This will treat large director switches as a single, big switch.

If -g, -u or -t are not specified, the switch name's suffix, after the first space, will be placed at the start of the name. For example, 'core5 Leaf 101' becomes 'Leaf101_core5'.

-p/--prefix prefix

Specifies the prefix to prepend to all NIC hostnames.

-s/--suffix suffix

Specifies the suffix to append to all NIC hostnames.

-F/--focus point

Specifies the focus area for output. Limits the scope of output to links that match any of the given focus points. May be specified up to 10 times.


Performs more topology file validation. Requires all links to resolve against nodes and all nodes connected to same fabric. Treats any resolution errors as fatal.


Performs strict topology file validation. Performs all checks in -C, and requires all nodes to list PortNum and all node list ports used.


Specifies the topology_input file to use. '-' may be used to specify stdin.

Point Syntax


value is node description (node name).


value1 is node description (node name); value2 is port number.


value is glob pattern for node description (node name).


value1 is glob pattern for node description (node name); value2 is port number.


value is node type (SW or NIC).


value1 is node type (SW or NIC); value2 is port number.


value is string for rate (25g, 50g, 75g, 100g).


value is MTU size (2048, 4096, 8192, 10240); omits switch mgmt port 0.


value is glob pattern for link details.


value is glob pattern for port details to value.


eth2rm -o slurm topology.xml

eth2rm -o slurm -F 'nodepat:compute*' -F 'nodepat:ethcore1 *'

eth2rm -o nodes -F 'nodedetpat:compute*' topology.xml

eth2rm -o hosts topology.xml


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