[Pacemaker] staggered resource startup

[Matthew O'Connor]

On 08/27/2013 06:18 PM, Andrew Beekhof wrote:
> Are you aware of this cluster option?
>
>        batch-limit = integer [30]
>            The number of jobs that the TE is allowed to execute in
parallel
>
>            The "correct" value will depend on the speed and load of
your network and cluster nodes.
>
> As long as the VMs are truly started before the resource agent reports
"done", then lowering this value should spread the load out more.
>
> There is also the possibility to specify ordering constraints with
kind=Serialize:
>
>   
http://clusterlabs.org/doc/en-US/Pacemaker/1.1-crmsh/html/Pacemaker_Explained/s-resource-ordering.html

No, I was not aware of this option.  The catch to the batch-limit will
be with the resource agent, as you said.  AFAIK this particular resource
agent reports that a VM is started once libvirt reports it's started,
though "started" and "booted" are very different states and libvirt does
not care about whether or not the VM successfully booted.  The load I'm
trying to limit occurs after the VM is started, i.e. while it's
booting.  So, I'm thinking to get what I want, I will need to use the
batch-limit in conjunction with a modified resource agent that will
delay reporting success until some timeout has been reached.  Ick...but
better than nothing! :)

Thanks for the info!
-- Matthew


-- 
Thank you!
  Matthew O'Connor
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