It's a bit LOL and a bit SAD...
I put the drives in different order and pulled the bad one out, so made a degraded, missing disk raid array. And guess what! The configuration importer saw 5pcs of disk in Online status colored GREEN! So I quickly imported the found config and put a disk into dedicated HSP and finally it started to rebuild.
WHY is this normal? IS THIS normal?
I spent more than 3 day trying to resolve this raid problem and a few more NOT doing anything. Yes, I was a fool not putting a HSP when I was building this raid, but this isn't normal...
Anyway: Do You have somekind of advice for WD Green disks? I was reading that I should disable the idle and enable the TLER. Anyone faced these with 2Tb WD Green disks?
Still waiting for the rebuild progress, it's almost 5%
(Message was edited by: mr.teecee) I marked this post as the solution.
The RAID5 array rebuild went fine, everything is OK and I put a hotspare now.
Anyway: I would be happy if anyone could tell me why was this unexpected working. (All the drives are OK, none of the remaining 5 HDDs were having even a tiny bit of SMART-errors.)
I'll mark my previous post as the answer.