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[OpenStack] [Nova] slowdowns during instance start


Hi guys,

I perform some tests with mass instance start on OpenStack, and faced with
slowdowns when run instances using euca-run-instances -n.
Up to nearly 80 instances all is OK (nearly 16 per minute), but after that
point instance running freezes (during 10 minutes nearly 5 fired up), and
after that continues with normal speed.

I know this is a bit syntetic, but this issue limits a bit vertical
scalability. Did anyone here faced with that already or have plans on
improvement of OS deployments' elasticity?

Nikolay Sokolov
Software Engineer
Grid Dynamics