We are currently trying to diagnose an ongoing issue with a clients backup in Backup Exec. They have an LTO4 Drive that they are backing up to. When they backup it fills the tape (which has a capacity of 800 GB), even though it is only 427 GB of data. It then ejects the tape and asks for more media). If you check the capacity on the tape (which has been fully erased before the backup) it tells you that it is using 800 GB on the tape, even though we have only backed up 427 in the backup job.
We originally thought this was the tape drive but when we do a seperate test backup to an external hard drive it backs up properly.
It is almost like anti compression!
We are using Backup Exec 11d. Anyone any ideas?