Ken Gaillot napsal(a):
On Fri, 2019-11-22 at 07:32 +0000, S Sathish S wrote:
Hi Team,
In Clusterlab below pacemaker and corosync version what is maximum
cluster nodes its supported ? will it support for 120 nodes in single
cluster?
corosync-2.4.4 à https://github.com/corosync/corosync/tree/v2.4.4
pacemaker-2.0.2 à
https://github.com/ClusterLabs/pacemaker/tree/Pacemaker-2.0.2
if we have 120 nodes in single cluster let us know if any impact or
consideration need to take for any cluster configuration parameter ,
please suggest.
let us know if any recommendation of cluster nodes limit pre-defined.
Thanks and Regards,
S Sathish
At this time, nowhere near 120 full cluster nodes are supported.
There's no official limit by the upstream projects, because so much
depends on hardware and applications, but commercial entities often
limit support to 16 or 32 nodes. Going above 16 will likely require
high-end hardware and careful tuning of corosync parameters.
Actually we were testing successfully 59 nodes with corosync 2 and no
"careful tuning" of corosync parameters was needed. Corosync 3 control
messages size was reduced significantly, so results should be even better.
No matter what, more than 32 fully synced nodes seems to be asking for
the problems and pcmk remote seems like a better choice.
Regards,
Honza
However pacemaker does support lightweight nodes via Pacemaker Remote:
https://clusterlabs.org/pacemaker/doc/en-US/Pacemaker/2.0/html-single/Pacemaker_Remote/
The scalability of Pacemaker Remote isn't well known. Some users have
reported problems with as few as 40 remote nodes, while others have
gotten above 100 without problems.
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