# Quorum in XtraDB Cluster - Monitor from Split-Brain **URL:** \ **Category:** Percona XtraDB Cluster 5.x\ **Created:** [May 5, 2014, 7:36am UTC](https://forums.percona.com/t/quorum-in-xtradb-cluster-monitor-from-split-brain/3447 "2014-05-05T07:36:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![chernovroman](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chernovroman](https://forums.percona.com/u/chernovroman)\ **Post date:** [May 5, 2014, 7:36am UTC](https://forums.percona.com/t/quorum-in-xtradb-cluster-monitor-from-split-brain/3447/1 "2014-05-05T07:36:37Z")
Hi support, I have 3 PXC nodes running on CentOS x64 servers and 2 GARBD (located in 2 HAProxy Load Balancers in front, CentOS x64 too), so in total I have 5 odd numbers of PXC nodes. If one of these nodes (1 of 2 garbd or 1 of 3 PXC) will fail (Ethernet link down, power failure, system OS errors, etc) I will have 4 PXC nodes and so on if will fail 3 PXC nodes, in such case it will Split-Brain ? How to avoid such situation? ---
**Author:** ![chernovroman](https://avatars.discourse-cdn.com/v4/letter/c/e19adc/32.png) [@chernovroman](https://forums.percona.com/u/chernovroman)\ **Post date:** [May 5, 2014, 7:38am UTC](https://forums.percona.com/t/quorum-in-xtradb-cluster-monitor-from-split-brain/3447/2 "2014-05-05T07:38:51Z")
If 2 PXC nodes will go down at the same time and I will have 2 GARBD and 1 PXC node? ---
**Author:** ![miguelangelnieto](https://avatars.discourse-cdn.com/v4/letter/m/b9e5f3/32.png) [@miguelangelnieto](https://forums.percona.com/u/miguelangelnieto)\ **Post date:** [May 19, 2014, 2:25am UTC](https://forums.percona.com/t/quorum-in-xtradb-cluster-monitor-from-split-brain/3447/3 "2014-05-19T02:25:28Z")
If one of 5 nodes go down, you won’t have split brain because those 4 have quorum. 4 against 1. The same applies if two nodes go down. 3 vs 2, so those 3 still have quorum.