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PostgreSQL 10 High Performance
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While a lot of high-level information about disk performance has been mentioned already, if you want to get useful benchmarks from drives, you'll need to know a bit more about their physical characteristics. This will drop back to theory for a bit, followed by examples of real measured disks that demonstrate common things you can expect to see.
Enterprise storage vendors like to talk in terms of input/outputs per second (IOPS). If you're buying a SAN, for example, expect to be asked "how many IOPS do you expect in total and per spindle?" and for measurements provided by the vendor proving good performance to be in this unit. This number represents typical disk performance on a seek-heavy workload and, unfortunately, it is a poor one to fixate on for database applications. Database applications are often complicated mixes of I/O with caching involved—sequential reads, seeks, and commits all compete—rather than always being...