John gives us the basics of i/o in Postgres from how it works, to what parts of the database use IOPS, how to measure it, and what to do to optimize it. John also explains new view for pg_stat_io just released with Postgres 16 and how this can be used for performance analysis.

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The article discusses the importance of understanding and optimizing disk IOPS for optimal performance in Postgres. It explains what IOPS are, how to measure them, and provides tips to improve disk IOPS. 

Understanding Postgres IOPS