Slow Duplication to Tape in Netbackup 6.5.2
I can't get more than 30 MB/s when duplicating from disk to tape. I've tried duplicating from different DSU's on SAN, NAS, and local storage. None will yield greater than 30 MB/s.
However, I can back up data on the same SAN, NAS, and local storage through the same media server to the same tape drive at 70 - 80 MB/s. That tells me that the source disk and the tape drive aren't my bottleneck.
I don't understand why a backup can be fast but a duplication with the same source and target can be so slow.
I've had a case open with support for months and they haven't been much help. I'm hoping someone here can help me.
Thanks for your time.