> On Nov 17, 2020, at 1:07 AM, hw <hw at gc-24.de> wrote: > > On Mon, 2020-11-16 at 18:06 -0500, H wrote: >> On 11/16/2020 01:23 PM, Jonathan Billings 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. >>> >> I see, thank you. Right now I am running off one of the disks because of the mishap, I am also waiting for a systemboard replacement at which time I can decided whether to go with Linux software RAID, ie mdadm, or back to the Intel BIOS RAID. >> >> The latter lacks any progress indicators in BIOS when rebuilding an array which took around 20 hours for a 256 GB RAID 1 setup and it is annoying not to know the status of the rebuild etc. Could mdadm in a command window helped me answer that question? >> >> Also, it seemed that the BIOS RAID damaged the partition table on the disks - should I expect that this happens? My guess would be no but what do I know... > > I'd use software raid rather the fakeraid. One of the advantages is that > you are not limited to the mainboard and can use the disks in another machine > if you need to. If you need to replace the board, you are not limited to > one that provides a compatible fakeraid. > > Using software raid with mdadm will give you indication about the progress > of rebuilds and checks by looking at /proc/mdstat, and you can automatically > get an email in case a disk fails if so configured. Being informed about > disk failures is relevant. > > I've used Linux software raid for at least 20 years and never had any problems > with it other than questionable performance disadvantages compared to hardware > raid. When a disk fails just replace it, and I've recently found that it > can be impossible to get a rebuild started with hardware raid, which makes it > virtually useless. > > I've never used the (Intel) fakeraid. Why would I? > > If you don't require Centos, you could go for Fedora instead. Fedora has btrfs > as default file system now which has software raid built-in, and Fedora can have > advantages over Centos. > There are advantages in a bleeding edge one can find useful. There is some bleeding too, plausible, so don’t be surprised. Valeri > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos