doc: add warning about SCSI PGRs/reservations

Signed-off-by: Mike Christie <mchristi@redhat.com>
(cherry picked from commit 62661a2e23ce98432f3c037fa9a8155a633ee182)

diff --git a/doc/rbd/iscsi-initiators.rst b/doc/rbd/iscsi-initiators.rst
index 4dc992af94805d3d341fda9924ee17eb1d911fdc..67447789d2b8bd6a6da6afc7549dde47d2de92d4 100644 (file)
--- a/doc/rbd/iscsi-initiators.rst
+++ b/doc/rbd/iscsi-initiators.rst
@@ -8,6 +8,12 @@ Configuring the iSCSI Initiators
 
 - `iSCSI Initiator for VMware ESX <../iscsi-initiator-esx>`_
 
+    .. warning::
+
+        Applications that use SCSI persistent group reservations (PGR) and
+        SCSI 2 based reservations are not supported when exporting a RBD image
+        through more than one iSCSI gateway.
+
 .. toctree::
   :maxdepth: 1
   :hidden: