All,
I have a question about the number of instances that can be created based on the compute nodes available cpu/memory . Is there any over provisioning? Or will the compute node stop adding instances once the memory or cpu limit has been reached.
Thanks, Peter Borghard
It seems that memory cannot be overprovisioned. At least on OpenStack layer as KVM itself can overprovision without any problems. CPU can be overprovisioned by setting "max_cores=N" in nova.conf on compute node to the number you want.
But in any case Mem/CPU counters are the hard limits and as soon as they are reached, new instance creation will fail. At least this is what happens with SimpleScheduler.
This doc may help you: http://docs.openstack.org/trunk/openstack-compute/admin/content/ramfilter.html (http://docs.openstack.org/trunk/opens...) I didn't try it.
Asked: 2012-07-15 09:23:41 -0500
Seen: 393 times
Last updated: Jul 17 '12
