doc: Added some pre-clarification for gdisk. Added DHO OSD hardware config.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

diff --git a/doc/config-cluster/file-system-recommendations.rst b/doc/config-cluster/file-system-recommendations.rst
index 5049f3892505370b614307bb277e7032b2849018..82972d7c4fb6bce857c7f188acb897fa10fddc21 100644 (file)
--- a/doc/config-cluster/file-system-recommendations.rst
+++ b/doc/config-cluster/file-system-recommendations.rst
@@ -11,6 +11,10 @@ Use ``hdparm`` to disable write caching on the hard disk::
 
        hdparm -W 0 /dev/hda 0
 
+In production environments, we recommend running OSDs with an operating system
+disk, and a separate disk(s) for data. If you run data and an operating system
+on a single disk, create a separate partition for your data before configuring
+your OSD cluster.
 
 Ceph OSDs depend on the Extended Attributes (XATTRs) of the underlying file
 system for:

diff --git a/doc/install/hardware-recommendations.rst b/doc/install/hardware-recommendations.rst
index bd4095976e063a69eb41e607dd454e666ef3dde7..969373005ea1fb33072e087a007afee669e84bda 100644 (file)
--- a/doc/install/hardware-recommendations.rst
+++ b/doc/install/hardware-recommendations.rst
@@ -1,24 +1,32 @@
 ==========================
  Hardware Recommendations
 ==========================
+
 Ceph runs on commodity hardware and a Linux operating system over a TCP/IP
 network. The hardware recommendations for different processes/daemons differ
 considerably.
 
-OSD hosts should have ample data storage in the form of a hard drive or a RAID.
-Ceph OSDs run the RADOS service, calculate data placement with CRUSH, and
-maintain their own copy of the cluster map. Therefore, OSDs should have a
-reasonable amount of processing power.
-
-Ceph monitors require enough disk space for the cluster map, but usually do
-not encounter heavy loads. Monitor hosts do not need to be very powerful.
+* **OSDs:** OSD hosts should have ample data storage in the form of a hard drive 
+  or a RAID. Ceph OSDs run the RADOS service, calculate data placement with 
+  CRUSH, and maintain their own copy of the cluster map. Therefore, OSDs 
+  should have a reasonable amount of processing power.
 
-Ceph metadata servers distribute their load. However, metadata servers must be
-capable of serving their data quickly. Metadata servers should have strong
-processing capability and plenty of RAM.
+* **Monitors:** Ceph monitor hosts require enough disk space for the cluster map, 
+  but usually do not encounter heavy loads. Monitor hosts do not need to be 
+  very powerful.
+  
+* **Metadata Servers:** Ceph metadata servers distribute their load. However, 
+  metadata servers must be capable of serving their data quickly. Metadata 
+  servers should have strong processing capability and plenty of RAM.
 
 .. note:: If you are not using the Ceph File System, you do not need a meta data server.
 
+Minimum Hardware Recommendations
+================================
+
+Ceph can run on inexpensive commodity hardware. Small production clusters
+and development clusters can run successfully with modest hardware.
+
 +--------------+----------------+------------------------------------+
 |  Process     | Criteria       | Minimum Recommended                |
 +==============+================+====================================+