To wrap up the QLC saga: Crucial P1 SSDs (QLC) peaking at >50% IO usage, >1s long tail latencies, cluster fell over under load, HDDs faster (!) Samsung 970 Evo Plus SSDs (TLC) peaking at ~3% IO usage, <10ms long tail latencies, cluster *very* happy. Stay away from QLC.
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Replying to @marcan42
Have a QLC drive here as well (Samsung QVO), it warms up quickly at full load, and throttles it's speed down sharply once it reaches a specific temperature. QLC drives do not seem suitable for constant load, more applicable to burst loads.
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Most M.2 drives warm up very quickly, need to buy a heatsink for them
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It's not an overheating issue, I checked.
5:21 AM - 29 Aug 2019
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