And as of writing those installers are build from our kiwi-ng config here:
No unfortunately not. Although if you don’t do Web-UI initiated balances or disk manipulations then it may just leave things well-alone and report it’s slightly confused interpretation. But note that these levels are the earliest additions to to btrfs and have had very little field testing even in comparison the the parity raids that are still known to be flaky. But at least they are based on better ‘grounds’ than the partiy 5/6 levels. I think you will also need to use a newer kernel for these levels as I don’t think openSUSE SuSE have back-ported these raid levels to Leap 15.3 or SLES 15 sp3 yet so that may be a warning of sorts also.
So take a look also at @kageurufu excellent recent post on their journey with doing the same, along with btrfs-progs, as they also are using RAID1C4 with our “Built on openSUSE” v4.
But keep in mind such things as are indicated in the following issue we have open on upstream kernel changes. It’s not just additions but also subtractrions/alterations that have to be accounted for when making such core changes to an os: