OSD — Object Storage Daemon
Definition
In Ceph distributed storage, an OSD is a daemon that manages a single storage device, handling read/write operations, replication, and rebalancing.
Context & Usage
A Ceph cluster typically has hundreds to thousands of OSDs across many storage nodes. Each OSD owns one disk (HDD or SSD). OSDs cooperate with monitors (MONs) and managers (MGRs) to form the cluster. Hardware impact: dedicated CPU cores per OSD (1-2 cores/disk for HDD, 4+ cores/disk for NVMe), sufficient RAM (~1 GB/TB rule), and dedicated network for OSD-to-OSD replication traffic.
Examples
- Red Hat Ceph Storage cluster with 240 OSDs across 20 nodes
- SUSE Enterprise Storage Ceph deployment
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