I've due RAID in a new OMV installation: 2 HD WDB Blue 320GB in Mirroring and 4 HD WD Green 1TB in RAID5.
I've installed OMV, then I connected the disks and wipe them.
Then I've create the two RAID.
Now, after the full sync, in File System menu I see the /dev/md127 about the RAID5 with ext4. I've only mount it.
Instead I see nothing about the two disk in mirroring.
I have to create, select the device /dev/md126 and then format it with ext4.
Why two mode to present the file system?
Finally, mounting the file system with RAID5 gave me an error and so I had to delete this file system and create a new one.
I'm sorry but this is a clean first installation and I worry when the NAS discs behave in a "non-standard" mode.