doc: Address further comments on choosing pg_num

Signed-off-by: Lars Marowsky-Bree <lmb@suse.com>
(cherry picked from commit 3a7e171df6b8a01197ff02a190f9f6e97e0d6627)

diff --git a/doc/rados/operations/placement-groups.rst b/doc/rados/operations/placement-groups.rst
index ba7cb575848aef7ee79fa232c460742c600d9a2c..a2c89e541a36216d866b74f0d18362b70a204e83 100644 (file)
--- a/doc/rados/operations/placement-groups.rst
+++ b/doc/rados/operations/placement-groups.rst
@@ -434,11 +434,12 @@ You should then check if the result makes sense with the way you
 designed your Ceph cluster to maximize `data durability`_,
 `object distribution`_ and minimize `resource usage`_.
 
-The result should always be **rounded up to the nearest power of two.**
-A power of two will evenly balance the number of objects among placement groups. 
-You could set it to a different value but you should be aware that this could result in 
-an uneven distribution of data across your OSDs. Use of such values shoud be limited to 
-incrementally stepping from one power of two to another.
+The result should always be **rounded up to the nearest power of two**.
+
+Only a power of two will evenly balance the number of objects among
+placement groups. Other values will result in an uneven distribution of
+data across your OSDs. Their use should be limited to incrementally
+stepping from one power of two to another.
 
 As an example, for a cluster with 200 OSDs and a pool size of 3
 replicas, you would estimate your number of PGs as follows::