AFAIK there is a defragmentation feature within Commvault, have you checked that out? Apart from that, the Isilon-Commvault Whitepaper [URL]  has this advice on page 21: "There is an option to remove the remaining aged data sooner by running a Data Verification job under the Deduplication Engine with the Reclaim Idle Space on Mountpaths option, though the job will consume resources on the Commvault servers and Isilon storage to consolidate backup container files into new files without holes and reclaim the old files."  This obviously refers to the Commvault software, and maybe support wanted to point you here (possibly with a confusing use of the word "Defragmentation" where it should be  "Deduplication"). hth -- Peter  
Hi All, Has anyone implemented defragmenter on PowerScale cluster on a backup workload? I have gone through the white papers but did not get much details
Defragmenter