Designing a production Proxmox HA cluster

Quorum, storage, networking, backup and operational considerations for production Proxmox VE.

Quorum determines cluster safety

Node count, corosync connectivity and failure domains must be designed so expected failures do not leave the cluster without safe decision-making capability.

Storage architecture changes failure modes

Ceph, shared storage and local replication each create different performance, recovery and operational characteristics.

HA does not replace backup

Automatic restart protects availability from some infrastructure failures; it does not provide historical recovery from corruption, deletion or compromise.

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