Migrating from X-RAID2 single redundancy to Dual redundancy

mdgm wrote:
you could say use 1x2TB and 4x4TB disks. This would give you more capacity than simply using 4x4TB disks. However do be aware of the expansion limitation that you cannot expand by more than 8TB over the life of the volume.

OK, so would this mean adding 4 x 4TB disks and leaving one of the 2TBs in place?

Re: expansion limitation - is there an easy way to check what volume capacity was at last factory default? IIRC, it would be the current capacity of 5.54TB, but it's been years and I'm not sure.

Would there be any additional benefits to a factory reset on this system?

Thanks again!