Hosting vm on simple disk with zfs or raid1?

I have 3 machines with 2x300 GB SAS and 2x2TB SAS drives. I installed the system on a the 2x300GB disks using RAID 1 ext4 (the system is rocky linux). I am now installing LXD but I hesitate to use each 2TB disks independently or merge them as a RAID1.

Sicne some applications are replicated to at lest 2 nodes for redundancy and then the data copied to each nodes, I am thinking I am wasting the storage. I think I have 2 alternatives:

  • build a 3-nodes CEPH cluster . But it’s apparently not advised in production ?
  • use each disks separately and copy snapshots between nodes

Is there any other alternatives? What’s the good pattern to use?