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The startup timeout runs from when a node's download last moved, so a model of hundreds of gigabytes on a slow mirror is not failed while it arrives. ctl model serve --env sets engine variables (NCCL_DEBUG=INFO) on every node, and a layout given by hand keeps expert parallelism for a model of experts. docs/large-models.md: how a model is split, what each way needs of a card, and a checklist for bringing one up on a fabric. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>