doc/rgw: document zone features

Signed-off-by: Casey Bodley <cbodley@redhat.com>

diff --git a/doc/radosgw/multisite.rst b/doc/radosgw/multisite.rst
index b216164d5d3606ffe87a56340fbf64349a568d48..5f2ffbd331ab23b59db8a73b2a50ce3b841fcc23 100644 (file)
--- a/doc/radosgw/multisite.rst
+++ b/doc/radosgw/multisite.rst
@@ -1489,5 +1489,65 @@ instance.
 +-------------------------------------+-----------------------------------+---------+-----------------------+
 
 
+Zone Features
+=============
+
+Some multisite features require support from all zones before they can be enabled. Each zone lists its ``supported_features``, and each zonegroup lists its ``enabled_features``. Before a feature can be enabled in the zonegroup, it must be supported by all of its zones.
+
+On creation of new zones and zonegroups, all known features are supported/enabled. After upgrading an existing multisite configuration, however, new features must be enabled manually.
+
+Supported Features
+------------------
+
++---------------------------+---------+
+| Feature                   | Release |
++===========================+=========+
+| :ref:`feature_resharding` | Quincy  |
++---------------------------+---------+
+
+.. _feature_resharding:
+
+resharding
+~~~~~~~~~~
+
+Allows buckets to be resharded in a multisite configuration without interrupting the replication of their objects. When ``rgw_dynamic_resharding`` is enabled, it runs on each zone independently, and zones may choose different shard counts for the same bucket. When buckets are resharded manunally with ``radosgw-admin bucket reshard``, only that zone's bucket is modified. A zone feature should only be marked as supported after all of its radosgws and osds have upgraded.
+
+
+Commands
+-----------------
+
+Add support for a zone feature
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+On the cluster that contains the given zone::
+
+    $ radosgw-admin zone modify --rgw-zone={zone-name} --enable-feature={feature-name}
+    $ radosgw-admin period update --commit
+
+Remove support for a zone feature
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+On the cluster that contains the given zone::
+
+    $ radosgw-admin zone modify --rgw-zone={zone-name} --disable-feature={feature-name}
+    $ radosgw-admin period update --commit
+
+Enable a zonegroup feature
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+On any cluster in the realm::
+
+    $ radosgw-admin zonegroup modify --rgw-zonegroup={zonegroup-name} --enable-feature={feature-name}
+    $ radosgw-admin period update --commit
+
+Disable a zonegroup feature
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+On any cluster in the realm::
+
+    $ radosgw-admin zonegroup modify --rgw-zonegroup={zonegroup-name} --disable-feature={feature-name}
+    $ radosgw-admin period update --commit
+
+
 .. _`Pools`: ../pools
 .. _`Sync Policy Config`: ../multisite-sync-policy