GPU Cluster Evidence, Readiness, and Fault Verdicts

For GPU clusters on SageMaker HyperPod (Slurm or EKS), AWS ParallelCluster, and self-managed EC2 or EKS. Generic investigation finds the obvious signals; this skill adds what it gets wrong: silent evidence, wrong-headline hardware verdicts, and predictable failures before a long run. Read-only. Never reboot, replace, update, or delete anything, and never read training data, checkpoints, or model weights.

Critical rules R1 to R11 (apply in every mode, in this order)