Merge pull request #31842 from sseshasa/wip-42662-nautilus

nautilus: osd/OSDMap: Show health warning if a pool is configured with size 1

Reviewed-by: Neha Ojha <nojha@redhat.com>

diff --cc PendingReleaseNotes
index 46f33bc5da97311a87b40634895bc62f8a6282d3,56f5a44d2dfcb6cdd04a8926375aa527a746016d..023d540977779f880e3029212e96fa5cf2fb44e7
--- 1/PendingReleaseNotes
--- 2/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@@ -14,9 -14,15 +14,20 @@@
  
      ceph osd pool set <pool-name> pg_autoscale_mode warn
  
 +* The behaviour of the ``-o`` argument to the rados tool has been reverted to
 +  its orignal behaviour of indicating an output file. This reverts it to a more
 +  consistent behaviour when compared to other tools. Specifying object size is now
 +  accomplished by using an upper case O ``-O``.
 +
  * The format of MDSs in `ceph fs dump` has changed.
+ 
+ * Ceph will issue a health warning if a RADOS pool's ``size`` is set to 1
+   or in other words the pool is configured with no redundancy. This can
+   be fixed by setting the pool size to the minimum recommended value
+   with::
+ 
+     ceph osd pool set <pool-name> size <num-replicas>
+ 
+   The warning can be silenced with::
+ 
+     ceph config set global mon_warn_on_pool_no_redundancy false