MariaDB MariaDB clustering minimum 3 servers

pamamolf · Jan 27, 2018

Hello

Why Mariadb clustering needs minimum 3 servers?

Is it for the brain split issue;

I thought that Mariadb had found a solution for this on latest versions....

Any other reasons?

Having also 3 servers maybe are not enough as even if a simple update or system restart will leave only two in the cluster for a while.....

Thank you !

eva2000 · Jan 27, 2018

that's why i said 3-5 servers

Getting Started with MariaDB Galera Cluster

Minimal cluster size
In order to avoid a split-brain condition, the minimum recommended number of nodes in a cluster is 3. Blocking state transfer is yet another reason to require a minimum of 3 nodes in order to enjoy service availability in case one of the members fails and needs to be restarted. While two of the members will be engaged in state transfer, the remaining member(s) will be able to keep on serving client requests.
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