Pretty much the title. TrueNAS installed, ran, and mostly worked on RAM that threw so many errors in MemTest I’m surprised the system posted at all. TrueNAS, being ZFS based, uses RAM heavily for caching, reading, and writing so data was getting corrupted in weird ways with confusing errors. What made it hard to pin down was that the system ran, created pools, and overall worked unexpectedly well where another OS probably would have failing during install; in a way, the simplicity of TrueNAS hid hardware instability. The errors only showed up when starting to work with data.
Even if you experience issues with a long running, otherwise issue free system, memtest as a first troubleshooting step. RAM can go bad over time (though that happens less often.)
Updated 2025/11/11
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