paul at paulgraydon.co.uk
Wed Jun 30 06:21:01 UTC 2010
Install iotop on the box and give it a shot. It's like top but for I/O
processes, and should tell you what process is doing a lot of reading
and writing, so hopefully you can track down the problem.
Also might be worth keeping an eye on your swap usage and general memory
health ("free -m", then look at the figure on the second row under
'free') , if you've not got much free then the system will be spending
time paging stuff to disk.
If you've not got anything monitoring standard server metrics (something
I always recommend), I'd suggest installing munin and munin-node. It's
great as a single or for monitoring a small number of servers, but
doesn't scale that well and isn't as flexible as some of the main
monitoring software. It is extremely easy to get set up and running.
Kaushal Shriyan wrote:
> Is there a way to know what causes high iowait on ubuntu server. I see
> high %wa intermittently on hardy 8.04 server. I have tomcat server
> running on it.
> Can it be alerted via email if for specific reason it occurs.
> Please suggest/guide further.
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