[Pacemaker] Pacemaker multi node configuration

[Andreas Kurz]

Hello,

On 10/05/2011 03:38 PM, Luciano Sitzia wrote:
> Hello Nick, I have already read this tutorial and for two node configuration
> is quite clear
> but I didn't get how to setup four primary nodes switching to the same
> secondary if one of 
> them will fail.

First a  question: Why would you want one node being completely idle
while it could run VMs and help decreasing per node load?

One solution I could think of for a such a dedicated cold standby server:

* for every VM resource set a score e.g. 100 for one preferred node out
of the four servers

* set a lower score e.g. 10 for every VM for the cold standby server

... on node failure (one of "the four"), the first destination for its
VMs will be the standby node as it has the next best score. The question
is what should happen on multi node failures .... or do you plan to not
let them happen? ;-)

For such a scenario I'd recommend having a look at the utilization
feature of pacemaker 1.1 in combination with different priorities for
your vms.

Regards,
Andreas

-- 
Need help with Pacemaker?
http://www.hastexo.com/now

> Do you have a tutorial/example where this situation is explained.
> 
> Thank you again.
> 
> My  best regards.
> 
> Luciano
> 
> -----Original Message-----
> From: Nick Khamis [mailto:symack at gmail.com] 
> Sent: mercoledì 5 ottobre 2011 14.45
> To: The Pacemaker cluster resource manager
> Subject: Re: [Pacemaker] Pacemaker multi node configuration
> 
> The DRBD site has a nice tutorial on Pacemaker + KVM. The rest of the
> example
> cover Xen etc...
> 
> http://www.linbit.com/en/education/tech-guides/highly-available-virtualizati
> on-with-kvm-iscsi-pacemaker/
> 
> Nick.
> 
> On Wed, Oct 5, 2011 at 8:31 AM, Luciano Sitzia
> <l.sitzia at lsinformatica.net> wrote:
>> Hello, I read pacemaker from scratch and pacemaker explained and I
> succeeded
>> in setting Active/passive clusters between two
>>
>> Node. Now I have to configure a cluster shared failover where four servers
>> are running KVM with all VM on  the shared storage
>>
>> SAN with GFS2 , one more server acts as KVM failover. I tried to realize
> how
>> to configure it but I got totally lost.
>>
>> Can you help me sending  me a sample configuration to understand what I
>> should do.
>>
>>
>>
>> Thanks in advance my best regards.
>>
>>
>>
>> Luciano
>>
>>
>>
>> Luciano Sitzia
>>
>> Via Palazzi, 8/G
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