5 Ceph can run with a cluster containing thousands of Object Storage Devices
6 (OSDs). A minimal system will have at least two OSDs for data replication. To
7 configure OSD clusters, you must provide settings in the configuration file.
8 Ceph provides default values for many settings, which you can override in the
9 configuration file. Additionally, you can make runtime modification to the
10 configuration using command-line utilities.
12 When Ceph starts, it activates three daemons:
14 - ``ceph-mon`` (mandatory)
15 - ``ceph-osd`` (mandatory)
16 - ``ceph-mds`` (mandatory for cephfs only)
18 Each process, daemon or utility loads the host's configuration file. A process
19 may have information about more than one daemon instance (*i.e.,* multiple
20 contexts). A daemon or utility only has information about a single daemon
21 instance (a single context).
23 .. note:: Ceph can run on a single host for evaluation purposes.
28 <table cellpadding="10"><colgroup><col width="50%"><col width="50%"></colgroup><tbody valign="top"><tr><td><h3>Configuring the Object Store</h3>
30 For general object store configuration, refer to the following:
35 Storage devices <storage-devices>
41 </td><td><h3>Reference</h3>
43 To optimize the performance of your cluster, refer to the following:
48 Network Settings <network-config-ref>
49 Auth Settings <auth-config-ref>
50 Monitor Settings <mon-config-ref>
52 Heartbeat Settings <mon-osd-interaction>
53 OSD Settings <osd-config-ref>
54 BlueStore Settings <bluestore-config-ref>
55 FileStore Settings <filestore-config-ref>
56 Journal Settings <journal-ref>
57 Pool, PG & CRUSH Settings <pool-pg-config-ref.rst>
58 Messaging Settings <ms-ref>
59 General Settings <general-config-ref>
64 </td></tr></tbody></table>