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A bash-first Linux playbook to diagnose and fix AI storage bottlenecks that leave GPUs idle: explains small-file, parallel, mixed I/O pain; supplies a baseline snapshot script and health checks; recommends filesystem/kernel tunings (noatime, lazytime, readahead, schedulers); reshapes datasets into shard archives with local NVMe caching; covers capacity/ulimit hygiene, NFS tips, and a checklist to lift GPU utilization.