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virtual machine priority

Hello Experts, I have a situation where I have to calculate/set the priority of VMs in the existing openstack environment which is using liberty version of openstack release. Say, in a blade there are few dev, QA and test VMs. Out of these 3 types of VMs I want to set higher priority to Dev VMs compared to QA's or Test VMs so that whenever there is resource crunch and when both Dev VM and QA VM requests comes at a same time to launch, the compute environment should calculate internally to give/allocate resources to Dev VM to launch it and keeps the priority of QA vm low which can be launched later.

Is there any existing facility available in compute schedulers or in recent openstack releases which can prioritize VM allocation/scheduling for different types of users?

I can find one such discussion on this link, but it is not helping much. link text

Please let me know your suggestions in this as I am new to openstack environment. thanks in advance for your replies.

best rgds, Sanjay