system interface. Since Luminous (12.2), BlueStore has been
Ceph's default and recommended storage back end.
+ Bucket
+ In the context of :term:`RGW`, a bucket is a group of objects.
+ Buckets are grouped into zones, and zones are grouped into
+ zonegroups. In an filesystem-based analogy in which objects are
+ the counterpart of files, buckets are the counterpart of
+ directories. :ref:`Multisite sync
+ policies<radosgw-multisite-sync-policy>` can be set on buckets,
+ to provide fine-grained control of data movement from one zone
+ to another zone.
+
Ceph
Ceph is a distributed network storage and file system with
distributed metadata management and POSIX semantics.