Clone readynas 3tb disk to smaller SSD

While not exactly a clone, there is a process to do that.  If you have files in user home folders or apps installed, you'll have to handle those separately.

1. Boot with the 3TB drive, turn off XRAID, then insert the SSD.

2. Create a new volume on the SSD.  Note that this will also create a RAID1 duplicate of your OS partition on the SSD.

3. Create shares to which you are going to copy your files.  They'll have to temporarily have different names.

4. Copy files from the 3TB drive to the SSD.  Using SSH to do this with the cp command is typically the fastest.  If there is anything in the /apps or /home directories, you'll have to temporarily store them elsewhere.

5. Power down, then re-boot with just the SSD.  The NAS will show the removed volume as missing.

6. DESTROY the missing volume.  This will cause the NAS to mark the SSD as the primary volume, and it should create an /apps and /home share, but it won't move anything there.  It also won't create individual user folders, those will be re-created when the user logs in.  Or you can use the mkhomedir_helper command to create them.

7. At this point, you can switch back to XRAID, re-name shares to be the same as they were on the original drive, and move any /apps and /home files where they belong.

This process leaves the 3TB drive in a condition where you could boot from it and all your files would be available.  It will show the new SSD volume as missing, but you can just ignore it or DESTROY it.

Instead of steps 5 and 6 above, you can alternately do this:

5.  EXPORT the 3TB volume.

6. Power down and remove the 3TB drive.

This will leave the 3TB drive un-bootable.  But you could put it back into the NAS as a secondary drive, and the NAS will re-import it to the system.  Note that the import will not move the /apps and /home folders back to the 3TB drive.  It will now be considered secondary, with the SSD primary.