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On Cisco UCS X210c M8, C220 M8, and C240 M8 servers, the system continuously reboots if you enable Intel SGX and set the PRMRR size to an unsupported value in the system memory settings. This issue occurs only when an unsupported PRMRR size is configured.

When enabling Intel SGX, make sure to configure the PRMRR size to a supported value.

X-Series M8: 6.0(1.252114)

C-series M8: 6.0(1.250192)

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On Cisco Unified Edge servers, when the host is powered off, the IMM Inventory page displays the LOM-NIC-1 interfaces as up on eCMC:A, but as down on eCMC:B. This inconsistency occurs only when the host is powered off. There is no functional impact due to this issue.

There is no known workaround.

6.0(1.251030)

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On Cisco Unified Edge servers, if the chassis enters an insufficient power state during runtime (after the node’s BMC has already booted), you can still power on the CPU using the physical power button on the front panel. This may cause the BMC to become unstable for that node, as indicated by specific logs/events. The issue does not occur if the chassis is already in a power-deprived state before the server boots.

Remove the node that is causing high power usage, or upgrade to a power supply unit (PSU) with higher wattage to provide enough power.

6.0(1.251030)

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On Cisco UCS XE M8 servers, the 2x10G front port (FP) LEDs remain ON even after the network cable is unplugged, if the port speed is set to 1 Gbps.

The LED only turns off after a full server power cycle.

Restart the server to turn off the LED after unplugging the cable from the 1 Gbps port.

6.0(1.251030)

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On Cisco Unified Edge servers, server discovery intermittently fails in the Intersight workflow with the error message: "Adapter model CPUIntegratedNIC is not supported." This issue occurs occasionally and does not affect every discovery attempt.

To resolve, re-initiate the discovery process when this error appears.

6.0(1.251030)

CSCwq72323

The Compute Sled may fail to power off due to a very rare internal CPU issue. During the power off process, the CPU does not set SLP4_N and SLP3_N signals low, preventing the system from powering down. Manual power operations via IMM may return errors such as Failed to set host power or Timer expired. The issue persists until the next AC cycle.

To restore normal operation, perform an AC cycle of the Compute Sled:

1. Log in to Intersight.

2. Navigate to Unified Edge > Unified Edge Chassis

3. Open the Actions drop-down menu on the right

4. Click Power Cycle Unified Edge Slot, enter the server slot number, and press the Power Cycle button

The system will become operational after a few minutes.

6.0(1.251030)

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Cisco UCS M7 servers are susceptible to host lockups triggered by ECC (Error Correcting Code) memory events.

This issue is specifically related to how the server’s BIOS interacts with the EFI (Extensible Firmware Interface) during error conditions. During these events, the BIOS does not correctly retrieve a required variable, causing EFI to return an invalid parameter. As a result, the operating system is unable to continue normal operation and freezes without logging any errors. When this occurs, the host becomes unresponsive and KVM (keyboard, video, mouse) input is not accepted.

Single-bit ECC errors—while not logged due to DDR5 specifications—can trigger this condition, resulting in complete loss of host responsiveness.

Downgrade server bundle:

• For X-Series servers, downgrade the server bundle to version 5.4(0.250040) or an earlier release.

• For C-Series servers, downgrade the server bundle to version 4.3(6.250044) or an earlier release.

X-Series M7: 5.4(0.250048)

C-series M7: 4.3(6.250053)

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On Cisco UCS C-Series M6 servers running CIMC 4.3.5 or later, enabling VMD in BIOS with multiple NVME drives can cause storage subsystem initialization to exceed 15 minutes, leading to Intersight Server Profile deployment failures. Disabling VMD or reducing the number of drives can resolve the issue. Earlier firmware versions may not be affected.

• If VMD is not needed, disable it.

• If disabling VMD is not possible, use the minimum number of NVME drives for setup, as more drives slow down system startup.

4.3(5.250001)

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On Microchip-based storage cards, the Virtual Drive (VD) shows as "Inoperable" even when all disks are online because the firmware automatically changes drive assignments to optimize performance, ignoring user settings from management tools.

Use arcconf output to check drive assignments in spans. Firmware may override management tool settings for better performance.

4.3(5.240134)

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After installing U3 Micron drives with capacities of 3.8TB or larger in JBOD mode behind the UCSX-X10C-RAIDF controller, Linux OS fails to boot due to BIOS errors related to loading the EFI boot image.

This issue occurs specifically on Cisco UCS X-Series M8 servers equipped with Intel® processors and affects multiple Linux distributions. The problem does notoccur when the drives are configured in RAID 0.Microsoft Windows® and Linux OS boot successfully on smaller capacity drives or when using RAID 0.

Install the OS on drive configured in RAID.

X210c: 5.4(0.250037)

X215c: 5.4(0.250035)