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[stor4nfv.git] / src / ceph / doc / rados / operations / data-placement.rst

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-=========================
- Data Placement Overview
-=========================
-
-Ceph stores, replicates and rebalances data objects across a RADOS cluster
-dynamically.  With many different users storing objects in different pools for
-different purposes on countless OSDs, Ceph operations require some data
-placement planning.  The main data placement planning concepts in Ceph include:
-
-- **Pools:** Ceph stores data within pools, which are logical groups for storing
-  objects. Pools manage the number of placement groups, the number of replicas,
-  and the ruleset for the pool. To store data in a pool, you must have
-  an authenticated user with permissions for the pool. Ceph can snapshot pools.
-  See `Pools`_ for additional details.
-
-- **Placement Groups:** Ceph maps objects to placement groups (PGs).
-  Placement groups (PGs) are shards or fragments of a logical object pool
-  that place objects as a group into OSDs. Placement groups reduce the amount
-  of per-object metadata when Ceph stores the data in OSDs. A larger number of
-  placement groups (e.g., 100 per OSD) leads to better balancing. See
-  `Placement Groups`_ for additional details.
-
-- **CRUSH Maps:**  CRUSH is a big part of what allows Ceph to scale without
-  performance bottlenecks, without limitations to scalability, and without a
-  single point of failure. CRUSH maps provide the physical topology of the
-  cluster to the CRUSH algorithm to determine where the data for an object
-  and its replicas should be stored, and how to do so across failure domains
-  for added data safety among other things. See `CRUSH Maps`_ for additional
-  details.
-
-When you initially set up a test cluster, you can use the default values. Once
-you begin planning for a large Ceph cluster, refer to pools, placement groups
-and CRUSH for data placement operations.
-
-.. _Pools: ../pools
-.. _Placement Groups: ../placement-groups
-.. _CRUSH Maps: ../crush-map