[Pacemaker] Announce: Making Resource Utilization Dynamic

[David Vossel]

----- Original Message -----
> From: "Michael Schwartzkopff" <misch at clusterbau.com>
> To: "The Pacemaker cluster resource manager" <pacemaker at oss.clusterlabs.org>
> Sent: Wednesday, June 5, 2013 1:44:56 PM
> Subject: [Pacemaker] Announce: Making Resource Utilization Dynamic
> 
> 
> 
> Hi,
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> 
> I was not satisfied with the situation that the utilization of resources is
> static. This is not how real world resources behave. Especially virtual
> guests in a clustered environment show daily load patterns. So I thought it
> would be a good idea to make the utilization of resources dynamic. I worte a
> small patch for the VirtualDomain resource agent that updates the CPU
> utilization every time it monitors the resource.

This is an interesting idea.

Depending on the type of load, it seems like having utilization rules be dynamic could lead to a situation where resources start migrating in a loop.  Maybe in some specific scenarios this could work, but for the most part I wouldn't think dynamic load balancing should live at the pacemaker resource management level.

I've been thinking a bit about how to leverage utilization rules better lately as well. My approach would be to have the resource agents actually enforce the utilization attributes associated with them in the cluster configuration. This could be achieved by using linux containers to enforce utilization constraints on non-virtual resources, or in the case of virtual resources, enforce the cpu and memory constraints on the actual virtual machine.

-- Vossel


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> Please read about the background in the following article:
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> http://www.sys4.de/de/blog/54/
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> Any comments?
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> Where can I send the patch to?
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> 
> 
> --
> 
> Dr. Michael Schwartzkopff
> 
> Guardinistr. 63
> 
> 81375 München
> 
> 
> 
> Tel: (0163) 172 50 98
> 
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