[openstack-dev] [nova] Configure overcommit policy

Alexander Kuznetsov akuznetsov at mirantis.com
Mon Nov 11 12:04:24 UTC 2013

Hi all,

While studying Hadoop performance in a virtual environment, I found an
interesting problem with Nova scheduling. In OpenStack cluster, we have
overcommit policy, allowing to put on one compute more vms than resources
available for them. While it might be suitable for general types of
workload, this is definitely not the case for Hadoop clusters, which
usually consume 100% of system resources.

Is there any way to tell Nova to schedule specific instances (the ones
which consume 100% of system resources) without overcommitting resources on
compute node?

Alexander Kuznetsov.
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