From: zdover23 <1445107+zdover23@users.noreply.github.com> Date: Tue, 8 Nov 2022 16:23:29 +0000 (+1000) Subject: Merge pull request #48785 from zdover23/wip-doc-2022-11-08-backport-48775-to-pacific-2 X-Git-Tag: v16.2.11~185 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=8817e8c45f5ff63133f86a47e04021351ee504a2;p=ceph.git Merge pull request #48785 from zdover23/wip-doc-2022-11-08-backport-48775-to-pacific-2 pacific: doc/glossary: link to OSD material Reviewed-by: Cole Mitchell --- 8817e8c45f5ff63133f86a47e04021351ee504a2 diff --cc doc/rados/configuration/storage-devices.rst index b3d6e6ca5d8d,f9c34d357cf6..8536d2cfaab4 --- a/doc/rados/configuration/storage-devices.rst +++ b/doc/rados/configuration/storage-devices.rst @@@ -4,28 -4,35 +4,34 @@@ There are two Ceph daemons that store data on devices: - * **Ceph OSDs** (or Object Storage Daemons) are where most of the - data is stored in Ceph. Generally speaking, each OSD is backed by - a single storage device, like a traditional hard disk (HDD) or - solid state disk (SSD). OSDs can also be backed by a combination - of devices, like a HDD for most data and an SSD (or partition of an - SSD) for some metadata. The number of OSDs in a cluster is - generally a function of how much data will be stored, how big each - storage device will be, and the level and type of redundancy - (replication or erasure coding). - * **Ceph Monitor** daemons manage critical cluster state like cluster - membership and authentication information. For smaller clusters a - few gigabytes is all that is needed, although for larger clusters - the monitor database can reach tens or possibly hundreds of - gigabytes. + .. _rados_configuration_storage-devices_ceph_osd: + + * **Ceph OSDs** (Object Storage Daemons) store most of the data + in Ceph. Usually each OSD is backed by a single storage device. + This can be a traditional hard disk (HDD) or a solid state disk + (SSD). OSDs can also be backed by a combination of devices: for + example, a HDD for most data and an SSD (or partition of an + SSD) for some metadata. The number of OSDs in a cluster is + usually a function of the amount of data to be stored, the size + of each storage device, and the level and type of redundancy + specified (replication or erasure coding). + * **Ceph Monitor** daemons manage critical cluster state. This + includes cluster membership and authentication information. + Small clusters require only a few gigabytes of storage to hold + the monitor database. In large clusters, however, the monitor + database can reach sizes of tens of gigabytes to hundreds of + gigabytes. + * **Ceph Manager** daemons run alongside monitor daemons, providing + additional monitoring and providing interfaces to external + monitoring and management systems. -OSD Backends -============ +OSD Back Ends +============= -There are two ways that OSDs can manage the data they store. Starting -with the Luminous 12.2.z release, the new default (and recommended) backend is -*BlueStore*. Prior to Luminous, the default (and only option) was -*Filestore*. +There are two ways that OSDs manage the data they store. As of the Luminous +12.2.z release, the default (and recommended) back end is *BlueStore*. Prior +to the Luminous release, the default (and only) back end was *Filestore*. .. _rados_config_storage_devices_bluestore: