We are in process of migrating from EMC Networker/Data Domain combo to Commvault 11 and are discovering all our Backups are taking atleast 2times of what they were in the old envoirnment.
For eg. Full Exchange DB backup of around 800 GB was around 1 Hr on EMC and takes more than 2 Hrs on Commvault.
Syntheic Full for a 2 TB Windows File Server backed up at Block Level was around 6Mins on EMC and is now 1:45hrs on Commvault.
Commvault Support has not been of much help saying they dont know what EMC was doing but Commvault is Fuctioning properly.