I have three nodes(as recommended, in different switches) forming a Galera Cluster. Is there any real requirement of 'Garbd'? I don't see much reasons for using this apart from avoiding split-brain or taking backups?

Another doubt regarding garbd is that suppose I have 3 nodes in the cluster, and adding a garbd node will make the cluster size of 4, which is an even-numbered quorum. Will this not cause a split-brain situation?

2 Answers 2


If you have minimum of three active nodes in your cluster, you don't need to add garbd.

You should use a garbd with the following conditions:

  1. When you have an even number of nodes and you can't add new nodes (because of cost or ...) to avoid split-brain situations.
  2. when you want to backup data (SST method) to a server.

More information: http://galeracluster.com/documentation-webpages/arbitrator.html

  • 2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
    – Rick James
    Dec 23, 2016 at 4:32

It's basically for 2 node clusters where you don't need a 3rd but need to avoid split brain.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.