We have a 2 node (VMs) SQL 2012 cluster (using Always on High Availability) which is currently setup "Node majority (no witness)" Quorum setting.
Both the nodes are in the same LAN in same site. Company does not have any other site.
We want to change it to "Node majority with witness (disk or file share)" to avoid any problems in future.
I have following 2 questions:
1. Can split brain occur with "Node majority (no witness)" Quorum setting considering both nodes (virtual machines) are in same site connected to same switches?
2. Can the change to quorum configuration be made without taking the cluster offline without any outage?