troubleshooting Question

LTO3 Tape not getting Native Capacity with Small Files

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andyvm asked on
Storage Software
3 Comments1 Solution529 ViewsLast Modified:
Hello,

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?

Thanks,
Andy
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