doc: Added a small ref section for osd config reference.

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

diff --git a/doc/rados/configuration/pool-pg.conf b/doc/rados/configuration/pool-pg.conf
new file mode 100644 (file)
index 0000000..6d28445
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+++ b/doc/rados/configuration/pool-pg.conf
@@ -0,0 +1,20 @@
+[osd]
+
+       # By default, Ceph makes 2 replicas of objects. If you want to make three 
+       # copies of an object the default value--a primary copy and two replica 
+       # copies--reset the default values as shown in 'osd pool default size'. 
+       # If you want to allow Ceph to write a lesser number of copies in a degraded 
+       # state, set 'osd pool default min size' to a number less than the 
+       # 'osd pool default size' value. 
+
+       osd pool default size = 3  # Write an object 3 times.
+       osd pool default min size = 1 # Allow writing one copy in a degraded state.
+       
+       # Ensure you have a realistic number of placement groups. We recommend 
+       # approximately 100 per OSD. E.g., total number of OSDs multiplied by 100 
+       # divided by the number of replicas (i.e., osd pool default size). So for
+       # 10 OSDs and osd pool default size = 3, we'd recommend approximately 
+       # (100 * 10) / 3 = 333.
+
+       osd pool default pg num = 333
+       osd pool default pgp num = 333
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