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One additional item Gao and apologies as I was thinking power on two front here. I assume then the limit here is per compute node within a given DC site, so yes I can see some small benefits on that for sure. I still however have a hard time seeing if I want to do scheduling based on power as one of my main attributes I need to schedule based on, but sure I can see some value in this.
Let me know when you flesh this out in the blueprint, would be willing to support and take some items for dev for this.

BR
Alan

From: Alan Kavanagh [mailto:alan.kavanagh at ericsson.com]
Sent: December-20-13 8:21 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI

Cheers Gao. So my only comment here is how complex and how many attributes are we expecting the scheduler to take as input. Similarly the more variables you schedule on the more complex the beast becomes and from experience you end up having cross dependencies.

I can see power be an item of concern but don't you think that we could solve that one with Nova Cells Parent being aware of the Power consumption costs at "time-T" and then just forward the Nova API call to the appropriate Child which has say the least power consumption cost?

Also, on a priority scale, some DC providers (speaking as one of the DC Providers here) will not have power cost on their top say 5 list for scheduling. So I agree its definitely interesting but if you consider scheduling inside a large DC in the same geographical region and Dc site, Scheduling for power consumption becomes null and void. ;-(

BR
Alan



From: Gao, Fengqian [mailto:fengqian.gao at intel.com]
Sent: December-19-13 11:10 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI

Yes, Alan, you got me.
Providing power/temperature to scheduler, set threshold or different weight, then the scheduler can boot VM on the most suitable node.

Thanks

--fengqian

From: Alan Kavanagh [mailto:alan.kavanagh at ericsson.com]
Sent: Friday, December 20, 2013 11:58 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI

Cheers Gao

It definitely makes sense to collect additional metrics such as power and temperature, and make that available for selective decisions you would want to take. However, I am just wondering if you could realistically feed those metrics as variables for scheduling, this is the main part I feel is questionable. I assume then you would use temperature &|| power etc to gauge if you want to schedule another VM on a given node when a given temperature threshold is reached. Is this the main case you are thinking of Gao?

Alan

From: Gao, Fengqian [mailto:fengqian.gao at intel.com]
Sent: December-18-13 10:23 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI

Hi, Alan,
I think, for nova-scheduler it is better if we gather more information.  And In today's DC, power and temperature are very important facts to considering.
CPU/Memory utilization is not enough to describe nodes' status. Power/inlet temperature should be noticed.

Best Wishes

--fengqian

From: Alan Kavanagh [mailto:alan.kavanagh at ericsson.com]
Sent: Thursday, December 19, 2013 2:14 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI

Hi Gao

What is the reason why you see it would be important to have these two additional metrics "power and temperature" for Nova to base scheduling on?

Alan

From: Gao, Fengqian [mailto:fengqian.gao at intel.com]
Sent: December-18-13 1:00 AM
To: openstack-dev at lists.openstack.org<mailto:openstack-dev at lists.openstack.org>
Subject: [openstack-dev] [Nova] [Ironic] Get power and temperature via IPMI

Hi, all,
I am planning to extend bp https://blueprints.launchpad.net/nova/+spec/utilization-aware-scheduling with power and temperature. In other words, power and temperature can be collected and used for nova-scheduler just as CPU utilization.
I have a question here. As you know, IPMI is used to get power and temperature and baremetal implements IPMI functions in Nova. But baremetal driver is being split out of nova, so if I want to change something to the IPMI, which part should I choose now? Nova or Ironic?


Best wishes

--fengqian

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