How do I move my existing unRAID array to a new system?
Before you shut down your current server, write down which disks (by make/serial number) are assigned to which (logical) slot in your array. Or do a screen capture of the Devices tab, press Alt-PrntScrn, paste in MS Paint or IrfanView, and print out. Stop the array and shut it down cleanly. After you start up your new array with your new motherboard, it is likely that the Linux devices (disk controllers/channels) will have changed, so check the Devices tab and re-assign any that are incorrect. The most important drive to assign correctly is the parity drive. It is not more important than your data, but if you assign one of your data drives to the parity slot as a result of getting the drives mixed up, it will result in your data drive being overwritten when a parity write occurs. For more detail and some good advice, see Replacing the Motherboard in Your unRAID Server.
