Mastering Proxmox - Third Edition

Monitor

A Ceph monitor (mon) is a cluster monitor daemon node that holds the OSD map, PG map, CRUSH map, and monitor map. Monitors can be set up on the same server node with OSDs or on a fully separate machine. For a stable Ceph cluster, setting up separate nodes with monitors is highly recommended. Since monitors only keep track of everything that happens within the cluster and not the actual read/write of cluster data, a monitor node can be very underpowered and thus less expensive. To achieve a healthy status of the Ceph cluster, a minimum of three monitors need to be set up. A healthy status is when every status in the cluster is OK, without any warnings or errors. Note that with the recent integration of Ceph with Proxmox, the same Proxmox ...