Poor performance during duplicate job
i'm running Backup Exec 2010 R2 on a Dell R510 with 12x 2TB as a RAID5 and a TL4000. The idea was to do backups to disk and then copy them over to LTO5 tapes. my problem is that the copy performance is really poor and far away from what is possible.
Backup of Exchange 2010 with three databases runs with a rate of 2.2GB/min and takes about 9 hours for 1.2TB.
Duplicate of this set runs with a rate from 1.1GB/min to 1.5GB/min and takes 16 hours, sometimes even 20 hours. sure it's more the obvious that it's hard to get a exchange backup and two copies to tape for on site and off site storage.
I'm pretty sure that the hardware is not the problem. i did some tests backing up data to tape from the disk where the backup2disk folders are located. it turned out that the server is able to write to tape a little bit more than 10GB/min.
how comes that a duplicate job with the same source and destination has such a big difference in job rate?