``rgw bucket default quota max size``, ``rgw user default quota max objects``, and
``rgw user default quota max size`` in `Ceph Object Gateway Config Reference`_
+Quota Cache
+-----------
+
+Quota statistics are cached on each RGW instance. If there are multiple
+instances, then the cache can keep quotas from being perfectly enforced, as
+each instance will have a different view of quotas. The options that control
+this are ``rgw bucket quota ttl``, ``rgw user quota bucket sync interval`` and
+``rgw user quota sync interval``. The higher these values are, the more
+efficient quota operations are, but the more out-of-sync multiple instances
+will be. The lower these values are, the closer to perfect enforcement
+multiple instances will achieve. If all three are 0, then quota caching is
+effectively disabled, and multiple instances will have perfect quota
+enforcement. See `Ceph Object Gateway Config Reference`_
+
Reading / Writing Global Quotas
-------------------------------