I am currently switching from DSM 6.2 to 7.1 and my setup is as follows:
How to expand drive number in DSM7?
Now my problem is, that it is not possible to do the same trick in DSM 7 to expand beyond x drives like it was in 6.2. (My setup would allow 22 in total from which 14 are used for now)
I already chattet with @Peter Suhabout this topic but unfortunetly we could not solve my problem.
Things I tried:
Building the loader as
I can finally report that I fixed it.
What I did to resolve my issue
tried to determine if it is a hardware/software failure
connected 8 disks to 1 HBA (HBA2 was not installed at that time) and checked if every disk was listed (computer management in windows server 2016, another OS would probably work as well)
unplugged HBA1 and connected HBA2 -> also checked if 8 disks were listed -> one disk was missing, so I checked all connectors and one was loose.