Ceph in Proxmox VE: Install and Monitor an HA Storage Cluster

Ceph is built on RADOS (Reliable Autonomic Distributed Object Store), which manages object storage and takes care of data distribution, redundancy and automatic recovery. On top of RADOS, Ceph offers RBD for block storage and CephFS for distributed file system access. The CRUSH algorithm handles data placement and spreads data evenly across nodes for fault tolerance and scalability.

To install Ceph in Proxmox VE:

1. Make sure you have at least one Proxmox node, though three nodes are recommended for production. Dedicated disks and a fast network such as 10GbE are strongly advised. 2. In the Proxmox web interface, go to Datacenter → Ceph → Install Ceph. 3. Choose the Ceph version you want and start the installation. 4. Configure the network settings once the installation completes. 5. Create Monitors (MONs) and Object Storage Daemons (OSDs). For production, at least three MONs and OSDs are recommended. 6. Check cluster health in the web interface to confirm all components are running properly.

Ceph needs regular monitoring. The main metrics are OSD status, Placement Group (PG) health, monitor availability, storage capacity, bandwidth usage and IOPS. Watching them protects data integrity, keeps performance stable and catches problems early.

With Proxmox and Ceph together, organizations can build scalable, self healing storage that supports high availability and current virtualization workloads.

1. Why are three nodes recommended for Ceph?

Three nodes give you quorum and redundancy, which improves fault tolerance.

2. Does Ceph replace backups?

No. Ceph provides redundancy and availability, but you still need independent backups.

3. What is RBD used for?

RBD provides block storage for virtual machines and containers in the Ceph cluster.