Tapes not filling up and compression is poor or 1:1
I've got an interesting problem here with tapes. We're running BE 2012, fully patched. We write to disk (Data Domain) and at month's end, we duplicate to tape on a Quantum Scalar 50 library (using Symantec drivers). This process works, however we're finding that each tape on the library says it has between 25-30GB of free space, yet BE reports it as full. We have infinite appends on as well for the media sets.
Additionally, most tapes report 1.0:1 compression. A few report 1.1:1 and one reports 1.8:1. Compression is lowest on tapes with more AVVI backups duplicated to them. The tape with 1.8:1 compression has mostly a backup using NDMP from a NAS, but also has some physical servers written to it and some virtuals.
It seems like we're taking a double hit here, loosing several hundred GB of space due to tapes not filling up. And then when you add in the poor compression, we're using more tapes than necessary.
Any suggestions? It seems like AVVI backups when duplicated, to not compress on tape. Anyone else seeing this?
Thanks in advance!