I'm wondering if someone can shed some light on why we are not getting near the native tape capacity on our LTO3 Tapes.
Our tapes are 400/800GB tapes. When I backup large files, I get somewhat good compression, but when smaller files are thrown into the mix, I get horrible capacity.
Here is what I'm getting:
Tape 1: 334.05GB of data, uses 389.6GB of tape
Tape 2: 292.30GB of data, uses 389.7GB of tape
Tape 3: 79.29GB of data, uses 73.7GB of tape
It appears, my issues are with small files, but I would like to know what the actual issue is. Is it related to the block size used? Currently our block size is 64kb. What happens when the tape backs up a 40kb file and compresses it?