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What Is Commissioning (Cx)?_

Commissioning (Cx) is the structured process of testing and verifying that an installed GPU cluster performs to its design intent before it is accepted into production. It runs in levels — from factory verification through site acceptance and integrated systems testing under load — each with a pass gate, and ends with an owner sign-off on the acceptance test plan. Commissioning is what separates a powered-on cluster from an accepted one.

Technical Details

A typical Cx workflow spans five levels: L1 factory witness and component verification against the bill of materials; L2 pre-functional checks of installed but de-energized systems (anchoring, grounding, power chain, mechanical cooling); L3 functional or site acceptance testing of each energized subsystem (power-on, liquid-loop leak test, POST, cable-plant certification); L4 integrated systems testing of the whole cluster under sustained load, including failure-mode tests such as pulling a power feed or failing a CDU pump; and L5 hand-off with the as-built package and formal sign-off. Each level gates the next, so faults are caught at the least costly stage. Commissioning produces the documentation set — test results, cable map, and operational baseline — that the operations team inherits.

How Leviathan Systems Works with Commissioning (Cx)

Leviathan Systems executes the full Cx L1-L5 workflow on the GPU clusters it deploys, delivering the as-built package and acceptance sign-off that transfers a cluster into production.

Appears In

White-Space Planning for Liquid-Cooled GPU HallsWarm-Water Cooling for GPU Clusters: Why Hotter Water WinsUPS & Battery Energy Storage for AI Halls: Ride-Through for Spiky GPU LoadsTwo-Phase vs Single-Phase Direct Liquid Cooling for GPUsTransceiver Breakout & Splitter Cabling for GPU FabricsThermal Soak & Burn-In During Commissioning: What to WatchGetting Ready for Rubin / VR200: Deployment-Readiness Planning NowRFP & SOW Checklist for a GPU Build: Scope It So Nothing Falls ThroughRear-Door Heat Exchangers vs Direct Liquid Cooling: Choosing Your Path to High DensityRaised Floor vs Slab for High-Density GPU HallsRack PDU Selection & Metering for GPU Racks: Outlet Count, Phase, TelemetryThe Power-On Walkdown: A Step-by-Step Energization ProcedurePower-On Sequencing for a GPU Hall: Inrush, Soft-Start, and Staged EnergizationScaling from Pilot to Production GPU Cluster: What Breaks and What to PlanNCCL All-Reduce Validation as a Cluster Acceptance GateMEP Coordination for AI Data Halls: Where Mechanical, Electrical, and IT CollideManifolds & Quick-Disconnects in DLC: Field Handling Without DripsBack-End vs Front-End Network Build-Out for GPU ClustersInfiniBand NDR/XDR vs RoCE: What Changes for the Cable PlantValidating an InfiniBand Fabric with ibdiagnet: Errors, Width, and RoutingHow to Choose a GPU Deployment Partner: A Buyer's ChecklistPre-Terminated Trunks vs Field Termination for GPU FabricHarmonics & Power Quality at GPU Density: Taming the Switch-Mode LoadH200 Deployment Guide: What's Different from H100 on the FloorH100 / HGX H100 Deployment Checklist: Power, Cooling, and Cabling DemandsGPU Data Center Deployment in Phoenix, Arizona: Hiring the Build CrewGPU Data Center Deployment in Ohio: Staffing the Physical BuildGPU Data Center Deployment in Northern Virginia: Who Does It and How to HireGPU Data Center Deployment in Georgia: Who Builds It and How to HireGH200 Grace Hopper Deployment Guide: Cabling and Cooling a Superchip NodeGB200 NVL72 Deployment Deep Dive: Liquid Loop, Busbar, and SpineFloor Loading for NVL72 Racks: Will Your Slab Hold ~1.4 Tonnes?Facility Water Loop Design for AI Halls: TCS to FWS Done RightDAC vs AOC vs AEC: Choosing GPU Rack Interconnect CablesCoolant Chemistry & Maintenance for Direct Liquid CoolingCondensation & Dew-Point Control in Liquid-Cooled GPU HallsCommissioning Levels L1–L5 for GPU Data Centers, ExplainedHow to Size a CDU for a GPU Cluster: Heat Load, Flow, Approach TempBusway vs Whip: Choosing Power Distribution for GPU RacksBreaker Coordination & Selective Tripping in GPU Power SystemsB300 Deployment Guide: The Physical-Layer Step Up from B200B200 / HGX B200 Deployment Guide: Power, Thermal, and Rack DemandsThe As-Built & Handoff Package Every GPU Deployment Should DeliverArmored vs Standard Fiber in the GPU Data Hall: When Ruggedization PaysAir-Cooled vs Liquid-Cooled GPU Platforms: Picking the Variant for Your SiteWriting an Acceptance Test Plan (ATP) for a GPU Cluster415V vs 480V Distribution in AI Halls: The High-Density Power Decision400G vs 800G vs 1.6T Optics: Selecting Transceivers for AI Fabric2N vs N+1 Power Redundancy for AI Clusters: What's Worth Paying ForSingle-Mode vs Multimode for AI Fabric: The Cable-Plant DecisionFiber Labeling at Scale: A Naming Scheme That Survives a 50,000-Link ClusterCable Pathways & Containment for GPU Rooms: Overhead Tray, Ladder, Fiber RunnerPatch-Panel & Cassette Design for GPU Halls: Breakout, Density, ServiceabilityNVIDIA B200 vs GB200: HGX vs Rack-Scale, and What Changes to DeployMPO Trunk Planning & Fiber-Count Math for GPU HallsNVIDIA GB300 NVL72 Explained: Specs, Power, and What It Takes to DeployDell vs Supermicro vs HPE GPU Servers: A Deployment ComparisonData Center Migration for AI Infrastructure: A Practical Field GuideNVIDIA H100 vs H200 vs B200: What Changes for DeploymentGoogle TPU vs NVIDIA GPU: What It Means for Your AI Infrastructure BuildDirect-to-Chip vs Immersion Liquid Cooling for GPU Data CentersData Center Rack-and-Stack Services for GPU Builds: What's IncludedLiquid Cooling vs Air Cooling in the Data Center: When the Crossover HappensHow to Choose a Data Center Liquid Cooling CompanyCommon GPU Deployment Mistakes — and How to Avoid ThemWho Deploys GB200 / GB300 NVL72 Infrastructure?How Long Does GPU Cluster Deployment Take?GPU Data Center Deployment in Texas: Who Does It and How to HireGPU Commissioning & Acceptance: What to Demand Before You Sign OffSite Readiness Before the GPUs Arrive: Power, Cooling, Floor, PathwaysRail-Optimized vs Fat-Tree: The Field Wiring Plan, Port by PortIn-House vs. Outsourced GPU Deployment: How to DecideGPU Rack Assembly: What Drives the CostSpectrum-X vs InfiniBand: What's Different for the Cable PlantHGX vs DGX: What's Different When You Deploy ThemPre-Power Inspection: The Walkdown Before Energizing a GPU HallGB300 NVL72 Deployment: Power, Cooling, and the Cable PlantGB200 vs GB300 NVL72: What Changes for DeploymentHigh-Density Rack PDU Install & Power-On: 415V Three-Phase Done RightGPU Rack Receiving, Staging & Lift Plan: Moving ~1,360 kg Racks Without DamageOverhead Busway Installation for 100kW+ GPU Rack DropsAir-to-Liquid Cooling Retrofit: The Install SideRear-Door Heat Exchanger (RDHx) Install & Facility Water Tie-InCoolant Distribution Unit (CDU) Installation & CommissioningStructured Cabling QA/QC for GPU Racks: Bend Radius, Slack, Torque, DressingOTDR & Insertion/Return-Loss Testing for GPU Cluster FiberMPO Polarity (Method A/B/C) for GPU Fabric — and the #1 Cause of Dead LinksFiber Cleaning & Inspection SOP for AI Interconnects (IEC 61300-3-35)Cable Labeling & As-Built Documentation for 100k-GPU Builds (TIA-606-C)Liquid-Cooling Loop Commissioning for GB200 & GB300 NVL72: Flush, Fill, Leak-Test, Accept