Harry,
ZFS will only compress data if it is able to gain more than 12% of space
by compressing the data (I may be wrong on the exact percentage). If ZFS
can't get get that 12% compression at least, it doesn't bother and will
just store the block uncompressed.
Also, the default ZFS compression algorithm isn't gzip, so you aren't
going to get the greatest compression possible, but it is quite fast.
Depending on the type of data, it may not compress well at all, leading
ZFS to store that data completely uncompressed.
-Greg
All good info thanks. Still one thing doesn't quite work in your line
of reasoning. The data on the gentoo linux end is uncompressed.
Whereas it is compressed on the zfs side.
A number of the files are themselves compressed formats such as jpg
mpg avi pdf maybe a few more, which aren't going to compress further
to speak of, but thousands of the files are text files (html). So
compression should show some downsize.
Your calculation appears to be based on both ends being uncompressed.
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