Proxmox VE use a quorum-based technique to provide a consistent state among all cluster nodes.
A quorum is the minimum number of votes that a distributed transaction has to obtain in order to be allowed to perform an operation in a distributed system. | ||
-- from Wikipedia Quorum (distributed computing) |
In case of network partitioning, state changes requires that a majority of nodes are online. The cluster switches to read-only mode if it loses quorum.
Proxmox VE assigns a single vote to each node by default.