Github user serg38 commented on the issue:
https://github.com/apache/cloudstack/pull/1813
@sadhugit NFS supports root disk resize with full clones. I don't see any
restriction in the code and it actually works on Vmware no matter what kind of
underlying storage technology is used for PS mapping to the hypervisor
@priyankparihar @borisstoyanov vmware.create.full.clone is a ConfigKey with
a scope of StoragePool so global setting may be overwritten on a particular
storage pool. This info won't be available until the volume is tried to get
created and resized. Root disk controller can be now extracted for each
template ( part of details response as per PR 1767) and combined with global
setting to make 'New Root disk size' box either grayed out or not.
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