On 11/16/2020 03:36 PM, John Pierce wrote: > the main advantage I know of for bios fake-raid is that the bios can boot > off either of the two mirrored boot devices. usually if the sata0 device > has failed, the BIOS isn't smart enough to boot from sata1 > > the only other reason is if you're running MS Windows desktop which can't > do mirroring on its own > > On Mon, Nov 16, 2020 at 10:23 AM Jonathan Billings <billings at negate.org> > wrote: > >> On Sun, Nov 15, 2020 at 07:49:09PM -0500, H wrote: >>> I have been having some problems with hardware RAID 1 on the >>> motherboard that I am running CentOS 7 on. After a BIOS upgrade of >>> the system, I lost the RAID 1 setup and was no longer able to boot >>> the system. >> The Intel RST RAID (aka Intel Matrix RAID) is also known as a >> fakeraid. It isn't a hardware RAID, but instead a software RAID that >> has a fancy BIOS interface. I believe that the mdadm tool can examine >> the RAID settings, and you can look at /proc/mdstat to see its status, >> although from what I remember from previous posts, it's better to just >> let the BIOS think it's a JBOD and use the linux software RAID tools >> directly. >> >> -- >> Jonathan Billings <billings at negate.org> >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> https://lists.centos.org/mailman/listinfo/centos >> > Thank you. As I mentioned, I am running from one disk but and the two disks have identical disk UUIDs, identical partition UUIDs, both of which I assume is an effect of the BIOS fake RAID. If I were to go with Linux mdadm and a RAID 1 configuration, am I correct in assuming that I would: - decide which one is the "master" disk - configure mdadm to sync to the other disk Would I need to change disk UUIDs, partition UUIDs on the second disk prior to this or mdadm would synchronize as needed? Thanks.