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Observed Symptoms Systems fail to power on. System hangs at "host boot in progress". When Cold Redundancy (CD) is enabled, iDRAC may place a PSU in standby, leading to power‑on failure.
When Cold Redundancy (CD) is enabled with A/B Grid Redundant, iDRAC attempts to maximize PSU efficiency by putting one PSU in a standby/light‑load state while the other carries most of the load. This can cause a PSU handoff problem, a timing issue during the power‑good assertion, or a misinterpretation of PSU status. These conditions may cause a rare intermittent power‑on failure and the system to hang at "host boot in progress".
Prerequisites Access to the iDRAC interface with appropriate credentials. Resolution Steps Access the iDRAC interface. Navigate to the Power Management settings. Manually disable the Cold Redundancy (CD) option. If the system displays amber blinking lights after power‑on, reboot the iDRAC. After the iDRAC reboot, optionally clear the system logs. Verification System boots past “host boot in progress” and powers on normally. Disabling Cold Redundancy (CD) keeps both PSUs active continuously, preventing the issue. NOTE: VSAN Ready nodes shipped with V4 IDM already have the Cold Redundancy (CD) option disabled by default.
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