Cisco UCS X-Series X-Fabric Module Installation Prerequisites

300-640 By islever Editorial Last updated

Short answer

AC You must power down all IFMs in the chassis and power down all blades that would connect to the X-Fabric modules before adding the module.

Question

To support growing AI workload requirements, a regional medical practice is adding new X9516 X-Fabric module, UCS PCI Mezz cards, and UCS X580p PCIe nodes to their existing X-Series chassis. Which two administrative actions must be taken before the X-Fabric module is added to the chassis? (Choose two.)
  1. Power down all IFMs in the chassis. Correct Answer
  2. Disconnect cabling between IFMs and fabric interconnects.
  3. Power down all blades that would connect to the X-Fabric modules. Correct Answer
  4. Install UCS PCI Mezzanine cards in X-Series blades.
  5. Disconnect device connector.

Key Takeaways

The main trap is assuming cable disconnection is required; the core requirement is strictly power management of the IFMs and connected compute nodes.

Learn the two required administrative actions for adding an X-Fabric module to a Cisco UCS X-Series chassis: powering down IFMs and associated blades.

Common mistake: Many candidates incorrectly choose to disconnect cabling (Option B) because they confuse X-Series with traditional Blade Center architectures where link disruption might be more heavily emphasized, but power-down is the primary safety constraint here.

Expert Analysis

The question addresses the physical installation procedures for Cisco UCS X-Series chassis, specifically regarding the addition of an X-Fabric module. The X-Series architecture utilizes a unique 'X-Fabric' design where compute nodes (such as the UCS X580p) connect directly to fabric modules via high-speed PCIe links. Unlike traditional UCS B-series blades that plug into a chassis midplane connected to Fabric Interconnects, X-Series nodes are electrically and logically tied to the specific X-Fabric modules they reside in.

When adding or replacing an X-Fabric module, safety and hardware integrity require that the components connected to that module be powered down. This includes the compute nodes (blades/PCIe nodes) that will use the new module's ports. Therefore, powering down the associated blades is a mandatory step to prevent electrical arcing or configuration conflicts during insertion. Additionally, the Intelligent Fabric Modules (IFMs) themselves must be powered down before physical removal or insertion to ensure safe handling and proper initialization.

Comments suggest conflicting views, with some arguing for disconnecting cables or device connectors. However, standard Cisco UCS X-Series hardware documentation specifies that while you must power down the IFMs and the associated blades, you do not necessarily need to disconnect all cabling (like FI-to-IFM links if they remain stable) or device connectors during the module swap, provided the power state is managed correctly. The critical actions are ensuring the source of power (IFM) and the destination consumers (Blades) are off.

Thus, the correct administrative actions are powering down the IFMs and powering down the blades that would connect to the new module.

Official Reference

These links open the official vendor documentation in a new tab.

Exam Strategy

For hardware installation questions involving modular chassis, always prioritize power-state management over physical disconnection unless specified otherwise. Identify which components draw power from the module being installed and ensure they are listed as 'powered off' in the procedure. In Cisco UCS, 'power down' is often the key verb for safe module insertion/removal.

Frequently Asked Questions

Do I need to disconnect the Fabric Interconnect cables when swapping an X-Fabric module?

No, disconnecting the cabling between IFMs and fabric interconnects is not a prerequisite for adding an X-Fabric module, as long as the IFMs and blades are powered down.

Why must blades be powered down before adding an X-Fabric module?

X-Series compute nodes connect directly to the X-Fabric modules via PCIe links. Powering them down prevents electrical issues and ensures the new module can initialize the connections safely.

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Community Votes

AC
60%
BC
40%

60% of anonymous learners picked answer AC. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 2 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 2

  1. Wasamela 👍 1
    Making a correction: A. Power down all IFMs in the chassis ❌ Not required for adding an X-Fabric module. B. Disconnect cabling between IFMs and fabric interconnects ❌ X-Series is designed with separate X-Fabric functionality; disconnecting FI-to-IFM cabling is not a prerequisite. E. Disconnect device connector ❌ Device Connector/Intersight connectivity is unrelated to the physical installation of the X-Fabric module. Answer: C and D
  2. Wasamela 👍 1
    A. Power down all IFMs in the chassis. In this case, when you adding or replacing fabric modules, power down associated Intelligent Fabric Modules. C. Power down all blades that would connect to the X-Fabric modules. Then X-Fabric modules connect to the compute/PCIe node pairs, which requires to be powered off before module insertion.

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