Hight disk latency after changing kernel

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.

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?

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Thanks for the info. <br> <br>I can safely ignore the warning now.

Its seems to be a kernel bug. Have the same problem when I went from 13.10 to 14.04 see <br> <br>

Kernel infos: <br>Original kernel: vmlinuz-3.8.0-38-generic (12.04) <br>Current kernel: vmlinuz-3.13.0-24-generic (14.04)