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Applies to SUSE Enterprise Storage 5.5 (SES 5 & SES 5.5)

Glossary Edit source


Admin node

The node from which you run the ceph-deploy utility to deploy Ceph on OSD nodes.


A point which aggregates other nodes into a hierarchy of physical locations.


An algorithm that determines how to store and retrieve data by computing data storage locations. CRUSH requires a map of the cluster to pseudo-randomly store and retrieve data in OSDs with a uniform distribution of data across the cluster.

Monitor node, MON

A cluster node that maintains maps of cluster state, including the monitor map, or the OSD map.


Any single machine or server in a Ceph cluster.

OSD node

A cluster node that stores data, handles data replication, recovery, backfilling, rebalancing, and provides some monitoring information to Ceph monitors by checking other Ceph OSD daemons.


Logical partitions for storing objects such as disk images.

Rule Set

Rules to determine data placement for a pool.

Ceph Specific Terms

Ceph Storage Cluster

The core set of storage software which stores the user’s data. Such a set consists of Ceph monitors and OSDs.

AKA Ceph Object Store.

Object Gateway

The S3/Swift gateway component for Ceph Object Store.

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