Foundation Services Rack power management

For proper operation of the Foundation Services Rack and to prevent issues, be sure you power on and power off the system appropriately and in the correct sequence, as described on this page.

1. Warnings and general notes

The following notices apply to the Foundation Services Rack.

Some components within the rack work at high voltage. To prevent personal injury and voiding of the warranty, do not attempt to service components except where noted.
To protect the Foundation Services Rack from interference and to prevent damage to its components, keep the front and rear rack doors closed during standard operation.
To prevent Foundation Services Rack components from overheating, keep the front and rear of the rack clear of obstructions to allow proper airflow.
Before powering on the Foundation Services Rack, read Foundation Services Rack hardware installation documentation (at to ensure that you understand any known issues or limitations.
Do not power off or reboot the Foundation Services Rack components during any firmware update procedure. Doing so might damage the Foundation Services Rack components, and damaged components might not be recoverable. Perform a shutdown or reboot only after a firmware update has been completed.
When the PDUs are physically connected to the datacenter’s power receptacles and power is applied to the rack, all Foundation Services Rack components begin to power on. The fans of these components initially run at full speed but eventually ramp down after the BMCs finish their boot sequence. Power is not immediately applied to the rack components because the breakers on the PDUs are turned off. You must manually turn on these breakers to begin feeding power to the Foundation Services Rack components.
Some devices in the Foundation Services Rack take longer than others to complete their power on boot sequence. Those devices may prevent access to other devices that boot faster until all devices have fully booted.

2. Power on the Foundation Services Rack

  1. To power on the rack, turn on the six circuit breakers for each PDU.

    When the PDUs are plugged into the datacenter power and you close the circuit breakers, power is automatically applied to the Foundation Services Rack components.

Figure 1 shows what a PDU circuit breaker group looks like and shows breaker switch 6 circled. Each PDU has a bank of three circuit breakers grouped together.

Circuit breaker on PDU
Figure 1. Circuit breakers on PDU

The networking equipment in the Foundation Services Rack completely boots when power is applied. There is no need to manually power on these devices.

SambaNova uses networking equipment from other suppliers. See Third-party documentation.

3. Gracefully shutting down the Foundation Services Rack

The switches and Serial Console Server are stateless devices and should not be harmed by unexpected shutdowns. However, to prevent the devices from logging unexpected power downs and showing that information when you power back up, it’s best to power off any devide from the GUI or CLI if available.

Power off the Juniper EX4300 switch last. Access to some other devices requires that the switch is working.
  1. Shut down the Juniper QFX5130 high-bandwidth data switch, the Lantronix SLC8000 serial console server, and the Juniper EX4300 access.

  2. When you power down the entire Foundation Services Rack, shut down the Juniper EX4300 access switch last, because that switch provides the network access to the system via the 1GbE network.

    See the product-specific documentation listed under Third-party documentation for information on how to shut down each of these network devices.

After shutting down these switches, you can no longer access the PDUs to cycle outlets because their network switch is down. You have to break and manually remake the relevant breakers from the physical PDU to properly cycle power. Alternatively, you can access the PDUs via their serial ports and use their CLIs.