Set up the basic skeleton for the large cluster support documentation

source/guides/admin-guides/large_clusters/databases/index.rst

@@ -1,24 +1,24 @@
-Databases
-=========
+Configure a Database
+====================
 
-xCAT Supports the following databases to be used by xCAT on the Management node
+xCAT requires a database to hold persistent information and currently supports the following:
 
-* SQLite
-* MySQL/MariaDB
-* PostgreSQL
-* DB2
+    * SQLite
+    * MySQL/MariaDB
+    * PostgreSQL
+    * DB2
 
 
 SQLite
 ------
 
-SQLite database is the default database used by xCAT and is initialized when xCAT is installed on the management node.
+The SQLite database (https://www.sqlite.org/) is the default database used by xCAT and is initialized when xCAT is installed on the management node.
+SQLite is a small, light-weight, daemon-less database that requires very little configuration and maintenance.  This database is sufficient for smarll to moderately sized systems (typeically < 1000 nodes).
 
-SQLite is a small, light-weight, daemon-less database that requires no configuration or maintenance.  This database is sufficient for small to moderate size systems ( < 1000 nodes ) 
+xCAT Hierarchy (Service Nodes)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-**The SQLite database can NOT be used for xCAT hierarchy support because service nodes requires remote access to the database and SQLite does NOT support remote access.**
-
-For xCAT hierarchy, you will need to use one of the following alternate databases:
+The SQLite datacase **CAN NOT** be used when using xCAT hierarchy support because the xCAT service nodes require remote access to the database.  This is one reason you would need to configure one of the alternative databases listed below:
 
 MySQL/MariaDB
 -------------
@@ -28,7 +28,8 @@ MySQL/MariaDB
 
    mysql_install.rst
    mysql_configure.rst
-
+   mysql_using.rst
+   mysql_remove.rst
 
 
 PostgreSQL
@@ -39,4 +40,5 @@ PostgreSQL
 
    postgres_install.rst
    postgres_configure.rst
-   postgres_tips.rst
+   postgres_using.rst
+   postgres_remove.rst

source/guides/admin-guides/large_clusters/index.rst

@@ -1,7 +1,20 @@
-Managing Large Clusters
-=======================
+Large Clusters
+==============
+
+When managing large clusters, it is recommended to have more than one node (Management Node, "MN") handling the installation and management of all the compute nodes.  These additional "helper" nodes are called **Service Nodes** ("SN").  The Management Node can delegate all management operational needs for a compute node to the Service Node responsible for that compute node.  There can be one or more Service Nodes configured to install/manage a group of compute nodes. 
+
+The following configurations are supported by xCAT:
+
+    * Each Service Node installs/manages a specific set of compute nodes
+    * Having a pool of Service Nodes in which any can respond to an installation request from a compute node 
+    * A hybrid of the above, where each specific set of compute nodes have 2 or more Service Nodes in a pool
+
 
 .. toctree::
    :maxdepth: 2
 
+   service_nodes/service_nodes101.rst
    databases/index.rst
+   service_nodes/define_service_nodes.rst
+   service_nodes/provision_service_nodes.rst
+   tips.rst

source/guides/admin-guides/large_clusters/service_nodes/define_service_nodes.rst

@@ -0,0 +1,2 @@
+Define Service Nodes
+====================

source/guides/admin-guides/large_clusters/service_nodes/provision_service_nodes.rst

@@ -0,0 +1,11 @@
+Provision Service Nodes
+=======================
+
+Diskful
+-------
+
+Diskless
+--------
+
+Verfication
+-----------

source/guides/admin-guides/large_clusters/service_nodes/service_nodes101.rst

@@ -0,0 +1,3 @@
+Service Nodes 101
+=================
+

source/guides/admin-guides/large_clusters/tips.rst

@@ -0,0 +1,5 @@
+Tips/Tuning/Suggestions
+=======================
+
+TODO: Content from: https://sourceforge.net/p/xcat/wiki/Hints_and_Tips_for_Large_Scale_Clusters/
+