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+-----------------------------
+Monitoring the iSCSI gateways
+-----------------------------
+
+Ceph provides an additional tool for iSCSI gateway environments
+to monitor performance of exported RADOS Block Device (RBD) images.
+
+The ``gwtop`` tool is a ``top``-like tool that displays aggregated
+performance metrics of RBD images that are exported to clients over
+iSCSI. The metrics are sourced from a Performance Metrics Domain Agent
+(PMDA). Information from the Linux-IO target (LIO) PMDA is used to list
+each exported RBD image with the connected client and its associated I/O
+metrics.
+
+**Requirements:**
+
+-  A running Ceph iSCSI gateway
+
+**Installing:**
+
+#. As ``root``, install the ``ceph-iscsi-tools`` package on each iSCSI
+   gateway node:
+
+   ::
+
+       # yum install ceph-iscsi-tools
+
+#. As ``root``, install the performance co-pilot package on each iSCSI
+   gateway node:
+
+   ::
+
+       # yum install pcp
+
+#. As ``root``, install the LIO PMDA package on each iSCSI gateway node:
+
+   ::
+
+       # yum install pcp-pmda-lio
+
+#. As ``root``, enable and start the performance co-pilot service on
+   each iSCSI gateway node:
+
+   ::
+
+       # systemctl enable pmcd
+       # systemctl start pmcd
+
+#. As ``root``, register the ``pcp-pmda-lio`` agent:
+
+   ::
+
+       cd /var/lib/pcp/pmdas/lio
+       ./Install
+
+By default, ``gwtop`` assumes the iSCSI gateway configuration object is
+stored in a RADOS object called ``gateway.conf`` in the ``rbd`` pool.
+This configuration defines the iSCSI gateways to contact for gathering
+the performance statistics. This can be overridden by using either the
+``-g`` or ``-c`` flags. See ``gwtop --help`` for more details.
+
+The LIO configuration determines which type of performance statistics to
+extract from performance co-pilot. When ``gwtop`` starts it looks at the
+LIO configuration, and if it find user-space disks, then ``gwtop``
+selects the LIO collector automatically.
+
+**Example ``gwtop`` Outputs**
+
+For kernel RBD-based devices:
+
+::
+
+    gwtop  2/2 Gateways   CPU% MIN:  4 MAX:  5    Network Total In:    2M  Out:    3M   10:20:09
+    Capacity:   8G    Disks:   8   IOPS:  500   Clients:  1   Ceph: HEALTH_OK          OSDs:   3
+    Pool.Image     Src  Device   Size     r/s     w/s    rMB/s     wMB/s    await  r_await  w_await  Client
+    iscsi.t1703          rbd0    500M       0       0     0.00      0.00     0.00     0.00     0.00
+    iscsi.testme1        rbd5    500M       0       0     0.00      0.00     0.00     0.00     0.00
+    iscsi.testme2        rbd2    500M       0       0     0.00      0.00     0.00     0.00     0.00
+    iscsi.testme3        rbd3    500M       0       0     0.00      0.00     0.00     0.00     0.00
+    iscsi.testme5        rbd1    500M       0       0     0.00      0.00     0.00     0.00     0.00
+    rbd.myhost_1    T    rbd4      4G     500       0     1.95      0.00     2.37     2.37     0.00  rh460p(CON)
+    rbd.test_2           rbd6      1G       0       0     0.00      0.00     0.00     0.00     0.00
+    rbd.testme           rbd7    500M       0       0     0.00      0.00     0.00     0.00     0.00
+
+For user backed storage (TCMU) devices:
+
+::
+
+    gwtop  2/2 Gateways   CPU% MIN:  4 MAX:  5    Network Total In:    2M  Out:    3M   10:20:00
+    Capacity:   8G    Disks:   8   IOPS:  503   Clients:  1   Ceph: HEALTH_OK          OSDs:   3
+    Pool.Image       Src    Size     iops     rMB/s     wMB/s   Client
+    iscsi.t1703             500M        0      0.00      0.00
+    iscsi.testme1           500M        0      0.00      0.00
+    iscsi.testme2           500M        0      0.00      0.00
+    iscsi.testme3           500M        0      0.00      0.00
+    iscsi.testme5           500M        0      0.00      0.00
+    rbd.myhost_1      T       4G      504      1.95      0.00   rh460p(CON)
+    rbd.test_2                1G        0      0.00      0.00
+    rbd.testme              500M        0      0.00      0.00
+
+In the *Client* column, ``(CON)`` means the iSCSI initiator (client) is
+currently logged into the iSCSI gateway. If ``-multi-`` is displayed,
+then multiple clients are mapped to the single RBD image.