Merge "[Docs restructuring] Storage requirements"

contents/contents-fuel-install.rst

@@ -1 +1,2 @@
 .. include:: pages/draft/fuel-install-guide/intro_planning_your_environment.rst
+.. include:: pages/draft/fuel-install-guide/sysreq_storage_reqs.rst

pages/draft/fuel-install-guide/sysreq_storage_reqs.rst

@@ -0,0 +1,37 @@
+.. _sysreq_storge_reqs:
+
+Storage requirements
+~~~~~~~~~~~~~~~~~~~~
+
+When planning storage for your OpenStack environment, understand the
+difference between the two types of storage that OpenStack uses:
+persistent and ephemeral.
+
+The nova-compute service manages ephemeral storage that is used as temporary
+storage for the operating system of virtual machine instances. When you
+delete an instance, nova-compute deletes the ephemeral storage as well.
+If you do not select any additional storage options, the virtual machine
+volumes will be stored on the local disks of the compute nodes, in the
+virtual storage partition. However, if you enable Ceph RBD back end for
+ephemeral volumes, nova-compute stores virtual machine volumes in Ceph.
+
+Persistent storage is the storage that exists outside an instance, in contrast
+to ephemeral storage.
+
+Fuel deploys storage for the following types of persistent data:
+
+* Glance, for image data, which can use either Swift or Ceph RBD as a
+  storage back end.
+* Cinder, for block data, which can use either LVM or Ceph RBD as a
+  storage back end.
+* Ceph RadosGW, for object storage, with Ceph RBD as storage back end.
+
+.. note::
+   Fuel plugins may provide additional storage options. For more information,
+   see the
+   `OpenStack Driverlog for the Fuel project <http://stackalytics.com/report/driverlog?project_id=openstack%2Ffuel>`_.
+
+.. seealso::
+
+  - `Storage Decisions
+    <http://docs.openstack.org/openstack-ops/content/storage_decision.html>`_