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+.. _ceph-iscsi:
+
+==================
+Ceph iSCSI Gateway
+==================
+
+The iSCSI Gateway presents a Highly Available (HA) iSCSI target that exports
+RADOS Block Device (RBD) images as SCSI disks. The iSCSI protocol allows
+clients (initiators) to send SCSI commands to storage devices (targets) over a
+TCP/IP network, enabling clients without native Ceph client support to access
+Ceph block storage.  
+
+Each iSCSI gateway exploits the Linux IO target kernel subsystem (LIO) to
+provide iSCSI protocol support. LIO utilizes userspace passthrough (TCMU) to
+interact with Ceph's librbd library and expose RBD images to iSCSI clients.
+With Ceph’s iSCSI gateway you can provision a fully integrated block-storage
+infrastructure with all the features and benefits of a conventional Storage
+Area Network (SAN).
+
+.. ditaa::
+                  Cluster Network (optional)
+                 +-------------------------------------------+
+                 |             |               |             |
+             +-------+     +-------+       +-------+     +-------+
+             |       |     |       |       |       |     |       |
+             | OSD 1 |     | OSD 2 |       | OSD 3 |     | OSD N |
+             |    {s}|     |    {s}|       |    {s}|     |    {s}|
+             +-------+     +-------+       +-------+     +-------+
+                 |             |               |             |
+      +--------->|             |  +---------+  |             |<---------+
+      :          |             |  |   RBD   |  |             |          :
+      |          +----------------|  Image  |----------------+          |
+      |           Public Network  |    {d}  |                           |
+      |                           +---------+                           |
+      |                                                                 |
+      |                      +-------------------+                      |
+      |   +--------------+   | iSCSI Initiators  |   +--------------+   |
+      |   | iSCSI GW     |   |   +-----------+   |   | iSCSI GW     |   |
+      +-->|  RBD Module  |<--+   | Various   |   +-->|  RBD Module  |<--+
+          |              |   |   | Operating |   |   |              |
+          +--------------+   |   | Systems   |   |   +--------------+
+                             |   +-----------+   |
+                             +-------------------+
+
+.. warning::
+
+   The iSCSI gateway is in maintenance as of November 2022. This means that
+   it is no longer in active development and will not be updated to add
+   new features. 
+
+.. toctree::
+  :maxdepth: 1
+
+  Requirements <iscsi-requirements>
+  Configuring the iSCSI Target <iscsi-targets>
+  Configuring the iSCSI Initiators <iscsi-initiators>
+  Monitoring the iSCSI Gateways <iscsi-monitoring>