Enterprise Open Source Software (OSS) Infrastructure
Proxmox VE Clustering at Scale
Proxmox VE combines KVM, LXC, and Ceph into a virtualization platform that can replace commercial hypervisor suites. Clustering adds quorum, live migration, and shared storage, each with its own failure modes. Scale changes the design: network separation, storage sizing, and upgrade sequencing become the main concerns.
要点
- Use a dedicated corosync network with low latency and redundancy.
- Keep cluster size odd and monitor quorum before performing maintenance.
- Separate storage, migration, and management traffic onto distinct links.
- Design Ceph with enough nodes and disks for the failure domain you claim.
- Test live migration under load rather than during a quiet window only.
- Stage upgrades one node at a time and verify quorum after each step.
- Back up VM configuration alongside disk images.
- Document recovery for a full cluster outage, which is different from single-node recovery.
常见问题
How many nodes do I need for Ceph?
Three minimum for meaningful redundancy, more for performance and capacity.
Can I mix storage types?
Yes, but predictable performance requires planning per pool and workload.
What happens if quorum is lost?
The cluster stops making configuration changes. Running VMs may continue, but management is restricted.
Is Proxmox supported commercially?
Yes through subscription support, which also provides tested repositories.
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