ana-ml2 ran overcommit_memory=0 with zero swap, capping the CommitLimit at
~RAM/2 (~283 GB of 566 GB). The resident vLLM services commit ~224 GB, so a
large model-file mmap (the 50 GB NVFP4 shard during HF->native conversion, or
a vLLM model load) failed with ENOMEM despite ~393 GB of RAM actually free.
overcommit_memory=1 is the conventional setting for ML hosts that mmap large
files. A drop-in under /etc/sysctl.d/ makes it reboot-durable. Operator-directed
permanent (2026-06-17). Idempotent via when:; sudo tee for the root-owned path
(elway runs steps as the SSH user, so a shell > redirect can't write there).
