Add abbility to do balancing only on files smaller than minimum ZFS block size

[TheSmoker]

I would guess it would help to only go through files with a filesize smaller that a certain value. A good place to start would be the block size of ZFS pool: zfs get special_small_blocks <pool_name>. Normally this is 128K.

So just add the check before doing anything with the file as wrinting those bigger files back and forth is just a waste of time. :)

Also given the small file size in the above case, this would work even better with a small (1GB) RAM drive and read the files there, then move them back from RAM disk.

[markusressel]

as wrinting those bigger files back and forth is just a waste of time.

I don't really understand the logic or reasoning behind this, but feel free to create your own version of the script in this repo to achieve it :)

[AT-StephenDetomasi]

IMO this only has limited utility. When adding a special device, you want both metadata and small blocks to be present. Having the metadata on the main pool would negate the performance benefits somewhat. Might as well go through the whole pool.