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?
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!
I was going to build another test server in different location to see if problem follows. My first test server was in New York 2. If yours was in different location let me know! <br> <br>Thinking this is something with munin or 14.04 rather than DO but have no clue how to correct. <br> <br>
My location is New York 2. <br>Yes, real performance of disk is fast, apparently the problem is focused in kernel diskstats info reported with /proc/diskstats. Comparing with another VPS of different provider running Xen shows: <br> <br>202 0 xvda 25327 394 557386 14570 1284988 1778684 25167696 4052686 0 369456 4065963 <br> <br>while my DO VPS shows: <br> <br>253 0 vda 260183 50 9542362 295950084 2318499 867088 55409896 388007768 0 1041416 13675936 <br> <br>Check seventh value corresponding to time spent reading (ms): <br> <br>14570 versus 295950084 <br> <br>Kernel bug? <br> <br>Edu
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and SMBs
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Get started for free
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.