Re: [ClusterLabs] Maximum number of supported cluster nodes differ in different sections of clusterlab.org documentation

[Reid Wahl]

On Wed, Aug 10, 2022 at 7:10 AM Michael Reichert  wrote:
>
> Hi,
>
>
> I would have a question regarding the maximum number of cluster nodes 
> supported by Corosync 3.x and Pacemaker 2.1.
>
> On the https://clusterlabs.org  entry page one can find the following 
> statement:
>
> „We support many deployment scenarios, from the simplest 2-node standby 
> cluster to a 32-node active/active configuration.“
>
>
> But in the  “Scaling a Pacemaker Cluster” chapter - 
> https://clusterlabs.org/pacemaker/doc/2.1/Pacemaker_Remote/html/intro.html - 
> one can find this contrary statement:
>
> „In a basic Pacemaker high-availability cluster [1] each node runs the full 
> cluster stack of Corosync and all Pacemaker components. This allows great 
> flexibility but limits scalability to around 16 nodes.“
>
>
> Is this just a documentation inconsistency from a previous release?

Thanks, Michael. Yes, and we're actually in the process of updating
the source for the Pacemaker Remote doc right now.

>
>
>
> Btw, current Linux distros like Redhat or SUSE both mention a 32 node upper 
> limit, too:
>
> https://access.redhat.com/articles/3069031
>
> https://documentation.suse.com/sle-ha/15-SP1/html/SLE-HA-all/cha-ha-concepts.html
>
>
>
> Thanks in advance!
>
>
>
> Regards,
>
> Michael
>
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-- 
Regards,

Reid Wahl (He/Him)
Senior Software Engineer, Red Hat
RHEL High Availability - Pacemaker

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[ClusterLabs] Maximum number of supported cluster nodes differ in different sections of clusterlab.org documentation

[Michael Reichert]

Hi,

I would have a question regarding the maximum number of cluster nodes supported 
by Corosync 3.x and Pacemaker 2.1.

On the https://clusterlabs.org  entry page one can 
find the following statement:

„We support many deployment scenarios, from the simplest 2-node standby cluster 
to a 32-node active/active configuration.“

But in the  “Scaling a Pacemaker Cluster” chapter - 
https://clusterlabs.org/pacemaker/doc/2.1/Pacemaker_Remote/html/intro.html - 
one can find this contrary statement:

„In a basic Pacemaker high-availability cluster 
[1]
 each node runs the full cluster stack of Corosync and all Pacemaker 
components. This allows great flexibility but limits scalability to around 16 
nodes.“

Is this just a documentation inconsistency from a previous release?

Btw, current Linux distros like Redhat or SUSE both mention a 32 node upper 
limit, too:
https://access.redhat.com/articles/3069031
https://documentation.suse.com/sle-ha/15-SP1/html/SLE-HA-all/cha-ha-concepts.html

Thanks in advance!

Regards,
Michael
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