After long considering what to use and how to configure my new NAS system I made following NAS
HP Gen8 with Intel Xeon E3-1220 V2 @ 3.10GHz and 4GB Memory and 4x10TB and 1TB HDD running OMV
What I did was add the 4x10TB, Actually they where 3,5" external HDDs and I removed the casing. Why? Those disks are cheaper than buying one without enclosure
I wiped the disks in OMV5 and added them as seperate Disk1 to Disk4
Than I installed the plugin UnionFS and Pooled 3 disks together
than I have the SNAPRAID plugin and added the 3 disks as content/data disk and added one disk for parity.
As I have 3 other HP Gen8 with OMV4 as well I am now busy with mounting those NAS through NFS and than with a simple rsync command I am migrating all the data.
Now creating the shares and setting the access rights correctly will be somehing .. but W'll be busy some days. I have 17TB to migrate ..