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Quorum best pratices on 4 node cluster

larsjohansen5
Occasional Advisor

Quorum best pratices on 4 node cluster

Hi,

 

I have a customer with 3 nodes in the same cluster, on the same location.

 

What are best pratices when inserting a 4th node? Should I use all of them as managers and put up a failover manager.

 

Or should I just use 3 as managers ?

 

What are pros and cons?

 

Greetings,

3 REPLIES
ftepe
Occasional Advisor

Re: Quorum best pratices on 4 node cluster

Hi,

 

you should use 4 physical + FOM = 5 managers...

 

2 Nodes can fail (e.g. seperatet in 2 locations).

 

I don't think using 3 physical + FOM is supportet because it should be an odd number of managers...

 

But when you add the node, the best practice analyser will tell you what to do :)

Bart_Heungens
Honored Contributor

Re: Quorum best pratices on 4 node cluster

Hi,

 

Indeed a FOM is only  possible and supported with 2 or 4 nodes... In the other cases you cannot add a FOM inthe cluster...

 

And you need in normal conditions 3 or 5 managers...

 

Kr,

Bart

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Emilo
Trusted Contributor

Re: Quorum best pratices on 4 node cluster

I would use 3 managers if these are in one site.

5 Managers are awfully chatty and really dont provide much more of a benifit.