Mastering Proxmox - Third Edition

OSD

The OSD is the actual storage media or partition within media, such as HDD/SSD, that stores the actual cluster data. OSDs are responsible for all the data replication, recovery, and rebalancing. Each OSD provides the monitoring information for Ceph monitors to check for heartbeats. A Ceph cluster requires a minimum of two OSDs to be in the active+clean state. The Ceph cluster provides feedback on the cluster status at all times. An active+clean state expresses an error- or warning-free cluster. Refer to the PG section for other states a Ceph cluster can achieve. As of Proxmox version 5.0, OSDs can be managed through the Proxmox GUI.