"... but would this raid-stripe-tree make it possible to re-balance raid1 data paired on specific devices (if balance was enhanced to support such)? Like re-balance raid1 data that is on paired on device 2&4 only?"
There's an answer with suggested workarounds. Look if this can be implemented properly.
Continued as a separate issue from https://github.com/kdave/btrfs-progs/issues/679#issuecomment-1750439414:
"... but would this raid-stripe-tree make it possible to re-balance raid1 data paired on specific devices (if balance was enhanced to support such)? Like re-balance raid1 data that is on paired on device 2&4 only?"
There's an answer with suggested workarounds. Look if this can be implemented properly.