Found it.
Although the requirements page specifies that it only need around 1.5gigs of HDD space, for some reasons 5gigs wasn't enough.
Assinged 10 gigs, works fine
Im a first time raid user.
In my current config, i use 2x 2TB drives.
My question is:
Is it normal that creating the array is like 4hours+ ?
Also 24.6Gb is already used (pretty sure the disks were empty when installing them)
Thanks