[Pacemaker] Load Balancing, Node Scores and Stickiness

[Andrew Beekhof]

On Thu, Oct 22, 2009 at 3:10 PM, Florian Haas <florian.haas at linbit.com> wrote:
> On 10/22/2009 02:37 PM, Andrew Beekhof wrote:
>>> I wondered, does it happen dynamically? If one resource starts using a
>>> lot of resources, are the other migrated to other nodes?
>>
>> Not yet.
>> Such a feature is planned though.
>>
>> At the moment pacemaker purely goes on the number of services it has
>> allocated to the node.
>> Total/Available RAM, CPU, HDD, none of these things are yet taken into account.
>
> Are there any plans on how this feature would look like in more detail?
> A daemon monitoring various performance indicators and updating node
> attributes accordingly? Couldn't that be done today, as a cloneable
> resource agent?

That would be one part, but you still need the logic in the PE to make
use of the attributes.

> Or are you referring to missing features actually evaluating such
> information, as in, rather than saying "run this resource on a node with
> at load average of X or less", being able to say "run this resource on
> the node with the currently lowest load average"?

right, that and "on a machine with 8Gb RAM and two VMs using 6Gb,
don't try to put another one that needs 4Gb"