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Hello,

 

I was wondering, what is the reason behind having nova audit resources as
opposed to using usage stats directly from what is reported by the compute
driver. The available resources reported from the audit can be incorrect
in some cases. Also, in many cases the reported usage stats from the
driver are correct, so auditing periodically while having the usage stats
from the driver is inefficient. One of the which result in an incorrect
audit is: existing VMs on a hypervisor that are created prior to deploying
nova. As a result, the scheduler will see more available resources than
what actually is available. I am aware that Nova shouldn't be managing VMs
that it hasn't created, but the reported available resources should be as
accurate as possible. 

 

I have proposed the following blueprint to provide the option of using
usage stats directly from the driver :

https://blueprints.launchpad.net/nova/+spec/use-driver-usage-stats

 

I would like to know what your thoughts are and would appreciate feedback.

 

Regards,

Maithem

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