elerium
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Hot Shot

Do you experience any congestion during the high write latency?

You will also want to see how much of the write cache on the SSD is already used up during the latency event. This is easier to see using SexiGraf (this is a free tool, just search google), which will show all the SSDs stats for a cluster on one page. I think in VSAN observer, if you deep dive to the SSD one of the graphs will show this too but for a single SSD at a time.

Just a theory but maybe the write buffer on the SSD fills up, then destaging to capacity disk becomes the bottleneck (this will show as congestion). Congestion will artificially introduce latency as a result which is maybe what you are seeing.

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