On Thu, 10 Jan 2019 at 11:35, Simon Matter via CentOS <centos at centos.org> wrote: > > On 1/9/19 2:30 AM, Gary Stainburn wrote: > >> 1) The big problem with this is that it is dependant on sda for booting. > >> I > >> did find an aritcle on how to set up boot loading on multiple HDD's, > >> including cloning /boot/efi but I now can't find it. Does anyone know > >> of a > >> similar article? > > > > > > Use RAID1 for /boot/efi as well. The installer should get the details > > right. > > Are you sure? How is the EFI firmware going to know about the RAID1? > > RAID1 is going to have type FD00 (Linux RAID) whereas EFI firmware expects > type EF00 (EFI System Partition) to boot from. > > It works on our Dell and IBM systems. I have multiple systems with multiple disk RAID1 /boot/efi disks. part raid.300 --fstype="mdmember" --ondisk=sda --size=477 part raid.310 --fstype="mdmember" --ondisk=sdb --size=477 part raid.320 --fstype="mdmember" --ondisk=sdc --size=477 part raid.330 --fstype="mdmember" --ondisk=sdd --size=477 part raid.340 --fstype="mdmember" --ondisk=sde --size=477 part raid.350 --fstype="mdmember" --ondisk=sdf --size=477 part raid.360 --fstype="mdmember" --ondisk=sdg --size=477 part raid.370 --fstype="mdmember" --ondisk=sdh --size=477 raid /boot/efi --device=1 --fstype="efi" --level=RAID1 --fsoptions="umask=0077,shortname=winnt" raid.300 raid.310 raid.320 raid.330 raid.340 raid.350 raid.360 raid.370 That said, I don't know what the low level items for it are or if this is universal. From dealing with various EFI chipsets.. I am guessing the standard is rather loose in what is EFI compliant :). > EFI then reads the GPT table directly and looks for a vfat filesystem to > boot from. Default Linux software RAID1 on EL7 uses metadata 1.2 which is > located at the beginning of the partition. EFI won't recognize the vfat > filesystem behind the RAID metadata. > > Maybe certain EFI firmware is more tolerant but at least in my case I > didn't get it to work on RAID1 at all. > > I'd really be interested if someone got it to work, how exactly it's > configured. How exactly do the GPT tables look, how exactly is the RAID1 > configured. > > Regards, > Simon > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > -- Stephen J Smoogen.