Understandable, I forgot that this is built ontop of LINTSTOR and not on DRBD directly. I belive then this post by LINBIT is more appropiate. Stacked Block Storage in LINBIT SDS (aka LINSTOR) This stack which is outlined seems interesting as it means we could for exampel use ZFS as volume manager and create a mirror-1 zpool for fast access, and raid-z2 or zfs draid for the slow access. Utilizing LINSTOR and DRBD for distributing this across the cluster. And utilizing bcache to unify these two zpools for using the fast/slow tier. I understand that right now the storage controller api of xcp-ng and xo is not setup to utilize such a setup. but could I potentially setup a ext4 or zfs filesystem ontop of this stack and use the already existing storage controller infrastructure, or would I be losing out on either performance and/or features by doing so.

@hellst0rm I don't see why it wouldn't work as long as everything is set to trust your internal CA root. It's pretty trivial to create a CA. I did it years ago because I can't stand cert errors and as a learning exercise. The only annoying part is it's just one more thing to keep track of and update, but if you're running a homelab it just becomes another part of the exercise.