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

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

1 files changed, 20 insertions, 0 deletions

diff --git a/doc/rados/configuration/pool-pg.conf b/doc/rados/configuration/pool-pg.conf
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index 00000000000..6d2844592f5
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+++ b/doc/rados/configuration/pool-pg.conf
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+[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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