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Neither of our (very good IMO) sysadmins bothered to check ECC counters on our existing server memory as far as I know. We did check SMART counters and SSD wear levels, though.. It is certainly a very good point that unusual numbers of ECC errors (corrected) are a bad sign and that machine should probably have its memory replaced at a minimum.

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I.. would probably have done that before concluding I didn't have any need for it. Even just do a quick one-off mcelog run to see what events have happened recently - you don't have to do some big statistical analysis.

I'd estimate about half the machines I've used with ECC have had at least one correction a year, maybe a quarter had one every few months. I've seen one-off weird bursts that never happen again, and I've had quite a few cases where ongoing corrections have indicated a DIMM needed reseating. An actual blatantly faulty DIMM's been quite rare.

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