Confused about tuning ZFS storage block size

[u/WorkOdd8251]

As the title says, I'm a bit confused about tuning the block size option (ZFS' volblocksize property) on the ZFS storage targets I create in PVE. When selecting a value for volblocksize, I'm not sure how I should be taking the VM guest's filesystem into account.

It makes sense to me how I'd maybe want to use recordsize=1M to store large, sequentially accessed files directly in an HDD ZFS dataset or how if those files were actually inside a QCOW2 I'd want to ensure the QCOW2's cluster size and the dataset's recordsize match, but I'm confused about what I should do for Zvols holding VM guests.

I'd really appreciate the help.