Topic
Testing & Commissioning_
Testing and commissioning is the final and most critical phase of any GPU infrastructure deployment. A single bad fiber splice in a 10,000-connection cluster can cause cascading performance degradation that’s nearly impossible to diagnose after the fact. Proper testing validates every connection before the cluster enters production, creating a documented baseline that simplifies future troubleshooting.
Leviathan Systems Scope_
Leviathan Systems performs comprehensive testing on every deployment: OTDR testing for fiber runs, insertion loss and return loss measurements, power meter and light source testing, copper cable certification, and full documentation with test reports and cable maps.
Articles_
Thermal Soak & Burn-In During Commissioning: What to WatchDetails the sequence, monitoring points, and acceptance criteria for sustained-load thermal soak on H100-GB300 NVL72 racks to expose marginal cold plates, power supplies, and optics before sign-off.The Power-On Walkdown: A Step-by-Step Energization ProcedureThis article provides the exact sequence of grounding, torque, and protection checks performed on GPU racks before first energization, including the specific order that prevents arc-flash and thermal events during commissioning.NCCL All-Reduce Validation as a Cluster Acceptance GateShows deployment engineers how to run and interpret NCCL all-reduce tests on the scale-out fabric as the final objective gate before cluster acceptance, separating intra-rack NVLink copper paths from inter-rack InfiniBand or Ethernet links.Commissioning Levels L1–L5 for GPU Data Centers, ExplainedDefines L1 through L5 commissioning levels for GPU racks with liquid cooling and scale-out fabrics, specifying the exact verifications performed at each stage for AI data center deployments.The As-Built & Handoff Package Every GPU Deployment Should DeliverThis article specifies the exact documentation deliverables for GPU rack commissioning, covering asset inventories, test reports, and as-builts that allow operators to bring clusters online without delays or rework.Writing an Acceptance Test Plan (ATP) for a GPU ClusterThis article specifies the exact sequence of sections, pass/fail criteria, and pre-energization checks required in an Acceptance Test Plan for GPU racks, separating internal copper NVLink verification from scale-out fiber work.GPU Commissioning & Acceptance: What to Demand Before You Sign OffA field-tested checklist of test results, as-built documentation, and acceptance criteria that data-center operators must demand from their deployment crew before signing off on a GPU rack—covering power, cooling, networking, and structural integrity for NVL72-class systems.Pre-Power Inspection: The Walkdown Before Energizing a GPU HallA step-by-step field guide to the pre-power walkdown inspection for a GPU hall, covering every check from rack bonding to MPO trunk continuity, with failure modes and decision criteria that prevent arc flash, data corruption, and costly rework.NCCL Bandwidth Validation: Proving a GPU Fabric Before ProductionA field engineer’s guide to running NCCL bandwidth tests on a deployed GPU cluster, interpreting results, and diagnosing fabric faults before production workloads begin.Thermal Burn-In for GPU Clusters: Duration, Watch Items, Pass/FailA field-proven protocol for thermal burn-in of GPU clusters (H100 and newer architectures in NVL72 racks), specifying soak duration, critical watch items, and objective pass/fail criteria to detect marginal hardware and cooling faults before production deployment.OTDR & Insertion/Return-Loss Testing for GPU Cluster FiberA field engineer's guide to certifying fiber links in GPU clusters using OTDR and insertion/return-loss testing, with acceptance thresholds and failure-mode diagnostics for NVL72-scale deployments.
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