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The Service Pack 17 contents page (http://documentation.commvault.com/commvault/v11_sp17/article?p=116602.htm) has a line item that correlates with this issue.
144. Do not delete the regkey DedupDrillHoles after upgrading to RHEL 7.6 or above
Does this mean that if SP17 has been applied to all nodes and the O/S updated that #144 present ...