Originally posted by kloczek
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The problem is that a "block", just like with an SSD memory cell or SMR zone, is a monolithic thing and I cannot just read parts of it, while a block is also big enough that it can contain parts from multiple files.
If the data I need is split inside 400 blocks or if it is split inside 4000, or 40000 the performance changes because now I need to read more blocks to get the same data.
In my entire career using ZFS since Solaris 10 beta (~19y) I never ever had needs to defragment anything.
Try it than we can talk ..
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