GPU Cluster Hardware and Deployment Interview Questions

Specify a cluster from workload and facility constraints, then derive node counts, network ports, storage bursts and acceptance tests.

Compare GPU memory, decode traffic and measured useful throughput. Work out a capacity ceiling without mistaking it for a performance forecast.

Compare rack-level power, cooling, structural and connectivity requirements with the offered site, then evaluate quoted deployment alternatives.

Diagnose failed 800G links using endpoint compatibility, lane modes, inventory and controlled swaps. Learn why speed labels and failure patterns do not prove a cause.

Build a cluster power budget with clear equipment boundaries, facility overhead and failover requirements. Distinguish energy use from reserved electrical capacity.

Derive cooling flow for a 4.8 MW hall, separate liquid and air loads, and test CDU capacity and redundancy at the actual design conditions.

Localize a slow fabric rail with matched tests, path comparisons and counter deltas. Separate an independent-bandwidth sum from collective completion time.

Bring up the supported hardware and software stack one dependency at a time, then prove correctness and recovery at increasing scale.

Define acceptance with component and system tests, absolute targets, peer comparisons and documented retests. Interpret burn-in exposure without treating it as a reliability guarantee.

Size adapter and full-parameter jobs before comparing RTX PRO 6000 and H100. Test memory headroom, MIG packing, software support and real communication costs.

Investigate rack power events at the correct electrical boundary and time scale. Test load reductions without assuming GPU caps control every watt or transient.

Count one complete rail, then distinguish logical links from cages, optical modules and cable assemblies. Derive power from the same physical inventory.

Diagnose a multi-node regression by comparing host and GPU transfer paths, active registration mechanisms and the tested software stack.

Build a storage budget that includes retained checkpoints, the next save, overlapping datasets and failure protection. Then check whether the same tier can meet write and restore deadlines.

Design a management path that survives specified production failures. Count all endpoint classes, restrict device authority and test the complete recovery route.

Compare cooling methods from the supported hardware and heat path. Calculate airflow or liquid flow, then verify capacity, residual air load and failure response.

Build a deployment schedule from dependencies and committed lead times. Calculate float and price the delay only when an action moves usable capacity earlier.

Estimate replacement demand over replenishment time, then size for shortage risk and failure correlation. Distinguish shelf parts from runnable spare nodes.

Investigate widespread acceptance failures using matched controls, valid thresholds and cohort denominators. Preserve hardware and shared causes as testable hypotheses.

Separate compute, storage and management responsibilities, then decide which need independent physical paths and count their endpoints correctly.

Count endpoints, allocate every switch port once, and compare a common fabric with independent rails before adding a third tier.

Compare 64 or 72 useful GPUs, identify the communication that could improve, and test whether a larger NVLink domain justifies the operational requirements.

Compare ownership, colocation and rental using the same useful work, full annual costs and realistic demand. Work a break-even from explicit assumptions.

Budget the full megawatt, fit whole servers, and compare useful training throughput under measured power limits. A worked cap example shows when more GPUs help.

Fabric Manager helps make an NVSwitch system ready. Learn the platform-specific roles, failure symptoms and checks that prove the communication path works.

Choose a supported tenant boundary, secure the surrounding services, and verify cleanup before reassignment. Calculate fragmentation from actual requests.

Map stable endpoints to rails, choose supported cables from measured routes, and verify topology before interpreting collective performance.

Reproduce the baseline, compare equivalent work, and trace the missing time. Acceptance, production and the original plan may differ in more than one way.

Protect running work, validate a supported upgrade bundle, and expand through measured cohorts with a tested recovery path.

Plan a GPU-generation migration around usable workload capacity, site readiness, compatibility and a tested rollback path.

Test the vendor claim on your workload, including quality, latency, scaling and operating costs. A lower peak or lower price alone does not settle it.

Gate admission with fresh, platform-aware evidence. Use absolute and peer baselines, budget test overhead and keep automated cordons under control.

Keep the full failure history and investigate what changed. One passing retry is evidence, but it is not a repair or an acceptance policy.

Survey real facility headroom, phase work around shared dependencies, and compare retrofit with relocation using useful capacity and total transition cost.

Define who owns each facility and hardware action, model restoration time, and verify power, cooling, telemetry and growth commitments before deployment.

Confirm the event definition and exposure, compare cohort rates, then test whether the cause follows a module, location or optical path.

Collect stable device identities, versions and freshness, then compare them with approved configurations and retain the history for investigations.

Compare complete fabric proposals on workload performance, support and total cost. Translate any measured regression into application impact before pricing the discount.

Compare the old fleet's useful value with operating costs and resale, verify its health, and complete data handling before reassignment or transfer.

Diagnose a rack outage through independent evidence, preserve safety interlocks, and restore capacity only after its failed paths pass acceptance checks.