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|High Performance Computing (HPC)||Mellanox OpenFabrics Enterprise Distribution for Linux (MLNX_OFED)||Setting up a basic infiniband network||Getting Started with InfiniBand||InfiniBand Subnet Manager|
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The InfiniBand subnet manager (OpenSM) assigns Local IDentifiers (LIDs) to each port connected to the InfiniBand fabric, and develops a routing table based off of the assigned LIDs.
There are two types of subnet managers:
A typical InfiniBand installation using the OFED package will run the OpenSM subnet manager at system start up after the OpenIB drivers are loaded. This automatic OpenSM is resident in memory, and sweeps the InfiniBand fabric approximately every 5 seconds for new InfiniBand adapters to add to the subnet routing tables. This usage will be sufficient for most installations, and can be controlled using the following commands:
/etc/init.d/opensmd start /etc/init.d/opensmd stop /etc/init.d/opensmd restart /etc/init.d/opensmd statusThere are several instances where the default usage will not be sufficient, however. If the head node is used as a compute node, and resources are at a premium, the OpenSM subnet manager can be set to run once, configure the LIDs and routing tables, and then exit:
opensm -oFor InfiniBand adapters with two ports, a second instance of the subnet manager must be active to enable a subnet on the second port. To begin, enable the subnet manager as above:
service opensmd start
service opensmd start Starting IB Subnet Manager. [ OK ] # ibstat CA 'mlx4_0' CA type: MT4099 Number of ports: 1 Firmware version: 2.30.8000 Hardware version: 1 Node GUID: 0x0002c90300b78240 System image GUID: 0x0002c90300b78243 Port 1: State: Active Physical state: LinkUp Rate: 40 (FDR10) Base lid: 1 LMC: 0 SM lid: 1 Capability mask: 0x0251486a Port GUID: 0x0002c90300b78241 Link layer: InfiniBand
If we have two ports we need to discover the GUID of the second port:
ibstat -pThis command will output two numbers, one for each port. Use the second number to start up a new OpenSM instance in daemon mode:
opensm -g <0xguid number> -BThere may also be an instance where the head node does not have InfiniBand hardware, but the compute nodes do. In this case, provided a hardware subnet manager is not used, one of the compute nodes must act as the subnet manager.
If there is already a subnet manager is running on the cluster, either
a hardware based version or an OpenSM instance, then running OpenSM on another node will cause the new
instance to be put in a STANDBY state. In this state, the instance listens for the existing OpenSM instance
to fail, and will take over subnet manager duties once a failure state has been detected.
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