On Tue 8 Nov 2022, at 09:48, Vukovics Mihály <v...@informatik.hu> wrote: > Hello Community, > > since I have upgraded my debian 10 to 11, the read IO wait time of all > disks have been increased dramatically. [...] > Chart attached, you can clearly see the date of the upgrade. > > Any ideas?
Hello, I'm not an expert in the area, but a few thoughts: --- (Seemingly unlikely issues) Hardware problems coincident with upgrade - smartmon tests? Fragmentation? What % capacity is used? What filesystem? --- RAID status? Have you rebooted? After a quick web search, this article suggests iowait may not be the best indicator of problems (though not sure if this extends to wait times for particular operations)... https://ioflood.com/blog/2021/01/25/iowait-in-linux-is-iowait-too-high/ ...does iostat's %util give cause for concern? (per the article) HDDs or SSDs? The article suggests ~100ms may be reasonble for HDDs - your chart only seems to show one outstandingly high wait time - do you actually notice a difference in performance? Not sure if any of that helps but I will follow the thread with interest. Nice chart btw. What produced the data and the chart itself? Best wishes, Gareth
