By Tony Tsang
After changing kernel (upgrading from ubuntu 12.04 to 13.04)
Munin start warning me the disk performance, like the following image. The avg io wait r/w stay at around 30 seconds.
http://picpaste.com/disk_latency-TuJXeSQS.png
But strangely enough, the server is running fine and no disk performance issue encountered.
When I verify it with the following command, the result seems normal.
sudo ioping /dev/vda -c 30
— /dev/vda (device 30.0 GiB) ioping statistics — 30 requests completed in 29.0 s, 911 iops, 3.6 MiB/s min/avg/max/mdev = 363 us / 1.1 ms / 3.4 ms / 668 us
Does munin reading something wrong, or did I miss something?
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Kernel infos: <br>Original kernel: vmlinuz-3.8.0-38-generic (12.04) <br>Current kernel: vmlinuz-3.13.0-24-generic (14.04)
Its seems to be a kernel bug. Have the same problem when I went from 13.10 to 14.04 see https://www.digitalocean.com/community/questions/14-04-munin-disk-latency <br> <br>
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