LXD on ZFS on LVM on H/W RAID 10

If you want to benefit from all ZFS advantages, you need to reinstall the server. Change the HBA configuration from RAID to JBOD (disable RAID). Make sure you can see all disks from the OS. Make sure you can see them as normal disk, not virtual disks exposed by the RAID controller. You should be able to see the hardware details of the disk, like vendor, model, serial number, maybe SMART attributes.

Check the disk sector size if it's 512, 4k or 8k. Create the pool with proper ashift value based on max sector size of the current disks and the disks you intend to add in the pool.