You can migrate a volume from one ReadyNAS OS 6 storage system to another, as long as you migrate every disk in the volume. For example, if you want to migrate a volume that contains two disks, you must add both disks to the new system. If you add only part of a volume to the new system, the system recognizes the disk as a degraded volume.

If your ReadyNAS storage system is operating with one or more disks, you can add disks while the system is running. The new system recognizes the migrated volume and its data. For more information about adding a disk while the system is running, see the How do I add a disk to my ReadyNAS OS 6 desktop storage system? support article.

If your ReadyNAS storage system does not have any disks installed, perform the following procedure.

To migrate a volume to a diskless ReadyNAS OS 6 system:

1. Gracefully shut down the new (diskless) storage system.
2. Remove each disk in the volume from the old system.
3. Install each disk in the volume into the new storage system.
4. Turn on the new system by pressing the Power button.

For more information about adding a disk while the system is running, see the How do I add a disk to my ReadyNAS OS 6 desktop storage system?  support article.

Source: Netgear