Klara seems to making many things in OpenZFS, I haven't been looking everything in detail, but I will just post a popular link for someone smarter. youtu.be/bAQQAzD-_fA

cp cp --reflink=never are not the same.. for newer Openzfs if one wants to change blocksize, moving files between datasets

richlowe: Considering how little things we wire up in the driver it's interesting that we hit those limits. One thing to note we have the older rewrite of the driver still. The Open Source drivers still lack Solaris and illumos integrations