If you are searching for an open source NAS hardware you can use to run OMV, then this might be interesting for you.
The Helios4 team is launching a Kickstarter campaign for the 1st Open Source and
Open Hardware NAS (Network Attached Storage). Along the lines of Raspberry PI
success, Helios4 is driving the way in open source collaborative approach by
unveiling a single board computer built around the Marvell Armada 388 ARM