Hello,
I had a problem with our mainboard due to a faulty bios update.
The board is a supermicro X10SAE. There are 2 drives attached as Raid 1. Operating System is Microsoft Server 2012 R2.
I bought a "new spare mainboard" same type but it came with a newer Bios. Computer booted. Unfortunately I missed to set "Default Bios setting for Sata Mode" = "AHCI" to "Raid" before I booted.
As said Computer booted and found operating system, which started and Win Server made automatically some configuration settings probably caused by AHCI mode. However System started, but it was of course in AHCI mode and the second harddrive was accessible as single drive in Win Server.
I powered down the Win Server and changed the SATA AHCI setting in Bios to RAID mode. Computer started and found my original RAID Array with Two "member disks". Status Normal. So far so good.
Then a message like "Missing Operating System" appeared. So I could not start resp. boot in RAID mode. If I switch back to AHCI it works, but I would have both drives working in RAID 1 as before.
I have read some forum articles and if I understand it correct: If you boot a Intel RAID system in AHCI mode instead of RAID is getting defect? Is this correct?
What happend? Was the MBR of the RAID destroyed by booting in AHCI mode or what is the reason?
And what is more important to me "How can I get back the system starting from RAID"?
Your help is appreciated.
Best regards!