Oracle RMAN and Commvault Deduplication

Question

Hi guys,If I want to achieve the best dedup efficiancy, I have to set the Max Open Files in the Commvault subclient(s) of an Oracle Instance to 1.Otherwise, RMAN will multiplex the number of files allowed into one channel / stream, which leads to poor dedupe ratio for the backups of this databases.Is there an option to influence the parameter of default subclient during instance creation when a new instance is discovered ?Setting the amount of streams and restricting the MaxOpenFiles might be beneficial when adding larger amount of Instances to the environment and where disk or cloud is the primary backup destination.rgdsKlaus

punbs · Answer

Hi ​@johanningk,At present, Commvault does not have an out-of-the-box option to enforce this setting globally during new instance onboarding or at the Client Computer Group level. I feel the best workaround is to utilize a custom RMAN script within the subclient backup schedule. You can navigate to Schedule Properties → Advanced Options and update the cusscript to include MAXOPENFILES = 1 inside the RMAN channel allocation block. This change will successfully apply to all clients associated with that specific schedule policy.

Oracle RMAN and Commvault Deduplication

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