doc: Update mirroring docs to mention data-pool configuration

Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
(cherry picked from commit 1e001c19e98ac1cd2428dd66f047ea4d6b2b01b1)

diff --git a/doc/rbd/rbd-mirroring.rst b/doc/rbd/rbd-mirroring.rst
index e4db92832768a118240c0af36f899c31fd7d1707..989f1fc3287d0c5ba25c620916bd47d467f16576 100644 (file)
--- a/doc/rbd/rbd-mirroring.rst
+++ b/doc/rbd/rbd-mirroring.rst
@@ -36,6 +36,13 @@ Ceph clusters.
    configuration file of the same name (e.g. /etc/ceph/remote.conf).  See the
    `ceph-conf`_ documentation for how to configure multiple clusters.
 
+.. note:: Images in a given pool will be mirrored to a pool with the same name
+   on the remote cluster. Images using a separate data-pool will use a data-pool
+   with the same name on the remote cluster. E.g., if an image being mirrored is
+   in the ``rbd`` pool on the local cluster and using a data-pool called
+   ``rbd-ec``, pools called ``rbd`` and ``rbd-ec`` must exist on the remote
+   cluster and will be used for mirroring the image.
+
 Enable Mirroring
 ----------------