Configuring multi-rail over TCP

The multi-rail over TCP (MROT) feature enables the concurrent use of multiple network interfaces and subnets. With MROT, the subnets attribute can be used to establish fault tolerance or automatic failover. All IP addresses that are defined in the subnets attribute are used to establish connections with the nodes within a cluster.

For more information, see the Configuring multi-rail over TCP (MROT) section in the IBM Storage Scale: Administration Guide.

Note: MROT and RDMA over Converged Ethernet (RoCE) coexist on the same IBM Storage Scale cluster at a specific time.

Assign IP addresses to interfaces.

essgennetworks -N <NodeName> --suffix=-ce --interface <InterfaceName> --MRoT <IP_Address> --netmask /24 --mtu 9000

A sample output is as follows:

[INFO]Starting network generation...
[INFO]nodelist: <IOnoden>
[INFO]suffix used for network hostname:-ce
[INFO]Interface(s) available on node <IOnoden>-ce 
[INFO]Considered interface(s) of node <IOnoden>-ce are ['enP48p1s0f0'] with RDMA Port ['Inbuilt'] for this operation
[INFO]Checking for IPv4 address assignment on node <IOnoden>
 
[INFO]Interface name enP48p1s0f0 consider for IP assignment with IP address 192.168.3.51 for node <IOnoden>-ce
[INFO]Successfully assigned IP Address to interface enP48p1s0f0 at node <IOnoden>-ce
[INFO]IPv4 Assignment successful. Reloading connections.
[OK] essgennetworks passed successfully
[INFO]IP address assignment completed, now follow Scale MRoT document to configure Multi Rail over TCP.

Note: The essgennetwork command does not configure the MROT end-to-end. This command assigns an IP address to the specified interface.