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[stor4nfv.git] / src / ceph / doc / rbd / iscsi-overview.rst

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-==================
-Ceph iSCSI Gateway
-==================
-
-The iSCSI gateway is integrating Ceph Storage with the iSCSI standard to provide
-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 SCSI storage devices (targets) over a TCP/IP network. This allows for heterogeneous
-clients, such as Microsoft Windows, to access the Ceph Storage cluster.
-
-Each iSCSI gateway runs the Linux IO target kernel subsystem (LIO) to provide the
-iSCSI protocol support. LIO utilizes a userspace passthrough (TCMU) to interact
-with Ceph's librbd library and expose RBD images to iSCSI clients. With Ceph’s
-iSCSI gateway you can effectively run a fully integrated block-storage
-infrastructure with all the features and benefits of a conventional Storage Area
-Network (SAN).
-
-.. ditaa::
-                  Cluster Network
-                 +-------------------------------------------+
-                 |             |               |             |
-             +-------+     +-------+       +-------+     +-------+
-             |       |     |       |       |       |     |       |
-             | OSD 1 |     | OSD 2 |       | OSD 3 |     | OSD N |
-             |    {s}|     |    {s}|       |    {s}|     |    {s}|
-             +-------+     +-------+       +-------+     +-------+
-                 |             |               |             |
-      +--------->|             |  +---------+  |             |<---------+
-      :          |             |  |   RBD   |  |             |          :
-      |          +----------------|  Image  |----------------+          |
-      |           Public Network  |    {d}  |                           |
-      |                           +---------+                           |
-      |                                                                 |
-      |                      +-------------------+                      |
-      |   +--------------+   |  iSCSI Initators  |   +--------------+   |
-      |   | iSCSI GW     |   |   +-----------+   |   | iSCSI GW     |   |
-      +-->|  RBD Module  |<--+   | Various   |   +-->|  RBD Module  |<--+
-          |              |   |   | Operating |   |   |              |
-          +--------------+   |   | Systems   |   |   +--------------+
-                             |   +-----------+   |
-                             +-------------------+
-
-
-.. toctree::
-  :maxdepth: 1
-
-  Requirements <iscsi-requirements>
-  Configuring the iSCSI Target <iscsi-targets>
-  Configuring the iSCSI Initiator <iscsi-initiators>
-  Monitoring the iSCSI Gateways <iscsi-monitoring>