While I was trying to create a mirror set with lvm, I was stopped by this error:
root@impact ~ # lvcreate -m 1 -L 10.9T -n Sphere Shapes /dev/mapper/12TBa1 /dev/mapper/12TBb1 modprobe: FATAL: Module dm-raid not found in directory /lib/modules/4.20.3-108.current /sbin/modprobe failed: 1 raid1: Required device-mapper target(s) not detected in your kernel. Run `lvcreate --help' for more information.
This was intended to be the first mirror set I put into my system, so I haven't actually seen this work in Solus before. I found this forum thread with someone running into a similar problem (lvm+raid5), but as far as I can tell, there was no follow-up bug report.