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Dell Chassis Management Controller Version 3.10 for Dell EMC PowerEdge VRTX User's Guide

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PCIe Power Ride-Through

Newly assigned PCIe cards in CMC VRTX must be discovered and initialized before a server node is powered on. The discovery and initialization process involves the following:

  • Inventory and discovery of installed cards

  • Preparing a PCIe card for exposure to a server module

  • Preparing multiple cards for configuration by server BIOS

  • Initializing all cards prior to blade node power-on

All these processes require few seconds to complete which causes a delay in initialization of the PCIe cards. The PCIe Ride-through feature in CMC VRTX reduces this process cycle time. The PCIe Ride-through feature enables the following:

  • The Server nodes are turned on quickly, thus turning on the PCIe cards quickly.

  • The powered state of PCIe cards is extended for a pre-defined time period in the following scenarios:

    • After the associated server is turned off.

    • After adapter discovery process is completed.

  • The power-on readiness state of the cards is extended for a predefined time after the discovery process. This extension eliminates the delays for common types of power cycling scenarios. The cards continue to be in ready state awaiting node assignment and power-up. The cards power-down after the time period expires.

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  • NOTE: At the end of the time period, the PCIe cards power-down. All adapters in ride-through are also powered down whenever the chassis door is opened.
  • NOTE:
    • If CMC has insufficient power, the CMC turns off all adapters in ride-through mode, thereby releasing all power allocated to those adapters. If the power supply is restored, the power is reallocated to the PCIe slots. This power restoration enables the cards to be ready for server allocation without delay.
    • All external PCIE adapters powered on as shared mode is excluded from the ride-through processes. After a shared adapter is powered on as a shared device, it remains powered on until the chassis is powered off.

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