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Question:

I'm looking to upgrade my DS214 to a DS423+

There are 2x4TB disks in the old NAS, in a RAID 0 configuration. Disk usage is 
around 6TB.

I'm planning to buy another 2x4TB disks for the new NAS. 

==== Solution 1: ====

If you buy at least 1 8TB disk you should be able to do it.
  
  * Put old disks in new NAS
  * Add the 8TB disk to the NAS and transfer all the data off the old disks
  * Wipe the old disks
  * Add the 2 old disks and the 2nd new disk as an SHR pool
  * Move all the data from the single 8TB disk to the 3 disk SHR pool
  * Wipe the 8TB disk and add it to the pool

If you only buy 1 TB disk you would and up wasting half of it, but if you ever 
upgrade your other disks then it would get used. Or you could just buy 2x8TB and 
have extra space.

==== Solution 2: ====


Put the old drives in the new NAS. Let it update itself.

Put the new drives in, and format them as a new storage pool named storage 
pool2. Make it BTRFS, SHR-1.

Use shared folder manager in the control panel to move all shared folders from 
the old storage pool 1 to the new volume on storage pool 2.

Format the old drives - just erase the storage pool, erase the volumes, etc.

Add the old drives to the new storage pool. It'll take a few days for this to 
happen.

And you're done.

The only problem is that the applications installed on your original storage 
pool won't move over. You'll either need to back them up with hyperbackup and 
restore to the new storage pool, or reinstall them from scratch once you get up 
and running with the new setup.