Question

14.04 Munin Disk latency

  • Posted on April 25, 2014
  • vpsAsked by Doug C

I am currently upgrading a server from Ubuntu 13.10 to 14.04. Building the 14.04 server from scratch and just moving data over to it.

Problem I am seeing is munin keeps giving me warning of Disk latency per device on the 14.04 server currently not under any load.

Disk latency per device Graphs shows on 14.04 cur min avg max VDA 11.25 366.56n 18.20 43.37

13.10 server under load cur min avg max VDA 222.42u 142.09u 1.44m 25.53m

for Average latency for dev/vda 14.04 I am just going to show average so far

Device IO Time 309.27u IO Wait Time 18.29 Read IO wait time 10.15 Write IO wait time 21.53

for Average latency for dev/vda 13.10 I am just going to show average so far

Device IO Time 209.54u IO Wait Time 1.43m Read IO wait time 318.84u Write IO wait time 7.95m

ioping currently shows about 260u on both servers.

Is this just a munin bug or do I have a problem. If bug how do I fix it?

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Apparently is a bug of Trusty kernel compilation: <br>https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1297522 <br> <br>

Ubuntu just released the kernel 3.13.0-36. Now digitalocean needs to update their systems to allow us to change the kernel on panel (and maybe the default as well).

@edujoseg: Thanks for finding that!