Hello Gareth,
the average io wait state is 3% in the last 1d14h. I have checked the IO
usage with several tools and have not found any processes/threads
generation too much read/write requests. As you can see on my first
graph, only the read wait time increased significantly, the write not.
Br,
Mihaly
On 2022. 11. 10. 16:13, Gareth Evans wrote:
On Thu 10 Nov 2022, at 11:36, Gareth Evans <donots...@fastmail.fm> wrote:
[...]
I might be barking up the wrong tree ...
But simpler inquiries first.
I was wondering if MD might be too high-level to cause what does seem more like a
"scheduley" issue -
https://www.thomas-krenn.com/de/wikiDE/images/d/d0/Linux-storage-stack-diagram_v4.10.pdf
but, apparently, even relatively "normal" processes can cause high iowait too:
NFS...
https://www.howtouselinux.com/post/troubleshoot-high-iowait-issue-on-linux-system
https://www.howtouselinux.com/post/use-linux-nfsiostat-to-troubleshoot-nfs-performance-issue
SSH...
Use iotop to find io-hogs...
https://www.howtouselinux.com/post/quick-guide-to-fix-linux-iowait-issue
https://www.howtouselinux.com/post/check-disk-io-usage-per-process-with-iotop-on-linux
What's a typical wa value (%) from top?
Thanks,
G
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