sureshanaparti commented on code in PR #622:
URL: 
https://github.com/apache/cloudstack-documentation/pull/622#discussion_r2744833469


##########
source/installguide/hypervisor/kvm.rst:
##########
@@ -1644,6 +1644,9 @@ In order to be able to perform Volume Snapshots on CentOS 
6.x (greater than 6.4)
 replace your version of qemu-img with one which has been patched to include 
the '-s'
 switch.
 
+CloudStack uses rbd cmd to get the physical size of the snapshots for the 
volumes on ceph
+primary storage. This requires ceph-common package to be installed on the KVM 
hosts. If it
+is not installed, the allocated size is used for the physical size.

Review Comment:
   ```suggestion
   is not installed, the allocated size is used for the physical size of the 
snapshots.
   ```



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