5.6. Quorum

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.

Note

Proxmox VE assigns a single vote to each node by default.