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Do you think Raspberries without ECC RAM are fine to use for a Ceph storage cluster? I did some research yesterday on the same topic, many say ECC Ram is essential for Ceph (and ZFS too). But I'm not sure what to believe, sure data could get corrupted in RAM before being written to the cluster, but how likely is that?

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ECC is not necessary for ZFS - this is a commonly repeated myth.

https://news.ycombinator.com/item?id=14447297

raspberry pi's have ECC memory; it's just on-die ECC.

(this was a surprise to me too)

It sounds like the ECC counters are completely hidden from the SoC, though: https://forums.raspberrypi.com/viewtopic.php?t=315415

Sounds like what DDR5 is doing too, errors are corrected automatically, but not necessarily communicated (?)/

DDR5 on-die ECC is not the same as traditional ECC. To that point, there are DDR5 modules with full ECC. On-die DDR5 ECC is there because it needs to be for the modules to really work at all.

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