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LTO3 Tape not getting Native Capacity with Small Files


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?

Storage Software

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8/22/2022 - Mon
Joseph Daly

I think that may be the issue you are running into. Kinda like the way in windows if you make a txt file with 1 character in it it should only have a size of a couple bytes however due to the sector size NTFS uses the file actually uses 4KB.

Gerald Connolly

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I derived the same, will look into further. Thanks, Andy
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