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Jul 1, 2020 · Databases

How to Configure fs.aio-max-nr for MySQL InnoDB to Prevent AIO Slot Errors

The article explains why MySQL may fail to start when the number of required AIO event slots exceeds the system's fs.aio-max-nr setting, demonstrates how to observe the slots with strace, and provides formulas and recommendations for configuring fs.aio-max-nr in single‑ and multi‑instance deployments.