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GPUs idle? You’ve got a storage problem. This hands-on Linux guide shows how to baseline, tune, and scale I/O for AI: install fio/sysstat/nvme-cli; benchmark with fio and iostat; use XFS with noatime, tune readahead/scheduler/queues; stripe NVMe via LVM/mdadm; pre-stage datasets and shard tiny files; monitor iotop/NVMe SMART; mind PCIe and TRIM; optimize throughput, concurrency, and tail latency—test safely (mkfs/RAID destroy data).