Hello milek, 
 That information remains true?

ZFS algorithm for selecting block sizes 

The initial block size is the smallest support block size larger than the first 
write to the file. 
Grow to the next largest block size for the entire file when the total file 
length increases beyond the current block size (up to the maximum block size). 
Shrink the block size when the entire file will fit in a single smaller block. 
ZFS currently support nine block sizes, from 512 bytes to 128K. Larger block 
size could be supported in the future, but see roch's blog on why 128k is enough


 Thanks.
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