Server increasing load due increasing processes in D state

[Alessandro Tagliapietra]

Sorry for disturbing again,  

after the restart I've seen that I'm unable to ssh to VM since on login they run byobu which now hangs (never did on VM).

I managed to ctrl-c fast enough to don't start byobu and an strace on it gave me this:

http://pastebin.com/raw.php?i=KYMbsxKV

Thanks

Best Regards

--

Alessandro Tagliapietra  
alexfu.it (http://www.alexfu.it)  

Il giorno lunedì 25 febbraio 2013, alle ore 17:51, Alessandro Tagliapietra ha scritto:  

> Hi Eduardo
>  
> Thank you for the tips.  
>  
> I'll wait a few days and let you know when this happens again.
>  
> About the load, system cpu wasn't more then 10% used from top, io wait was at 2% most of the time.
>  
> We've 4 x 2 (HT) cores on the server and a total number of 19 vcpu allocated on VM running on that host.
>  
> Vm runs mostly nginx+php-fpm+mysql, one runs also rabbitMQ and a python rabbitMQ consumer.
>  
> I'll let you know later then.
>  
> Thanks again!
>  
> Best
>  
> --
>  
> Alessandro Tagliapietra  
> alexfu.it (http://www.alexfu.it)  
>  
> Il giorno lunedì 25 febbraio 2013, alle ore 16:44, Eduardo Damato ha scritto:  
>  
> >  
> > Hi Alessandro,
> >  
> > Thanks for the information.
> >  
> > The sysrq-t that I requested is *only* useful during the problem. Please
> > do that when you encounter the problem again.
> >  
> > It may be that you are overcommitting cpus on your system by having many
> > virtual machines running on the nova controller node. This is a
> > completely wild guess, but I would recommend you to look at how many
> > cpus you have and how many virtual machines and if you have any
> > processes in real time or sched FIFO.
> >  
> > Cheers,
> > Eduardo.
> >  
> >  
> >  
>  
>  

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