A subnet manager must be running in your environment on your switch or on your hosts. If you are running it host-side, use the following procedure to set it up.

Steps

  1. Install the opensm package on any hosts that will be running the subnet manager.

  2. Use the ibstat -p command to find GUID0 and GUID1 of the HBA ports. For example:

    # ibstat -p
 0x248a070300a80a80
 0x248a070300a80a81

  3. Create a subnet manager script that runs once as part of the boot process.

    vim /usr/sbin/subnet-manager.sh

  4. Add the following lines. Substitute the values you found in step 2 for GUID0 and GUID1. For P0 and P1, use the subnet manager priorities, with 1 being the lowest and 15 the highest.

    #!/bin/bash

opensm -B -g <GUID0> -p <P0> -f /var/log/opensm-ib0.log
opensm -B -g <GUID1> -p <P1> -f /var/log/opensm-ib1.log

  5. Create a systemd service unit file named subnet-manager service.

    vim /etc/systemd/system/subnet-manager.service

  6. Add the following lines.

    [Unit]
Description=systemd service unit file for subnet manager

[Service]
Type=forking
ExecStart=/bin/bash /usr/sbin/subnet-manager.sh

[Install]
WantedBy=multi-user.target

  7. Notify systemd of the new service.

    systemctl daemon-reload

  8. Enable and start the subnet manager service.

    systemctl enable subnet-manager.service
systemctl start subnet-manager.service