Richard Elling <richard.ell...@gmail.com> writes:

> Harry Putnam wrote:
>> Robert Milkowski <mi...@task.gda.pl> writes:
>>
>>   
>>> Then is block doesn't compress better than 12.5% it won't be
>>> compressed at all. Then in zfs you need extra space for checksums, etc.
>>>
>>> How did the OP came up with how much data is being used?
>>>     
>>
>> OP, just used `du -sh' at both ends of the transfer.  On origin end it
>> is gentoo Linux running reiserfs filesystem
>>   
>
> The size allocated is dependent on file system features. For example, a
> zero-filled file named "zeros" copied to 3 different file systems shows:
>
> $ du -sh /A/zeros
> 0K /A/zeros
> $ du -sh /B/zeros
> 16K /B/zeros
> $ du -sh /C/zeros
> 32K /C/zeros

Yes, I made note of that in my OP on this thread.  But is it enough to
end up with 8gb of non-compressed files measuring 8gb on
reiserfs(linux) and the same data showing nearly 9gb when copied to a
zfs filesystem with compression on.  

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