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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