I have a Dell PowerEdge 2650 with on-board Adaptec Perc3Di SCSI RAID controller (mirrored 18GB drives for OS). It also has an add-in Adaptec 2810SA 8-channel SATA RAID card. After installing FC3, and installing GRUB to the MBR of the mirrored 18GB drives for OS, when I boot the system, I get "GRUB Loading Stage2Read Error". The Dell system and both RAID controllers were updated to their latest BIOS versions prior to installing the OS. I even tried (to no avail) booting the system into rescue mode with the setup CDs and once booted, I chroot'ed, ran: "grub-install /dev/sda". When I remove the add-in card from the system, grub works perfectly off of the on-board Adaptec Perc3Di SCSI RAID controller (mirrored 18GB drives for OS). I don't think the latest Dell BIOS for this machine has the provision to boot from add-in cards first, or to prioritize add-in cards after the on-board devices. I do know that the SATA add-in controller definately comes up first after POST before the on-board SCSI controller's BIOS. As suggested by various people, I booted the system into rescue mode with the setup CDs and once booted, I chroot'ed, ran: grub grub> root(hd0,0) grub> setup(hd0) This command did not return any errors. All output looked successful and normal from my experience on single-disk systems. /boot/grub/devices.map, fdisk -l, and grub tab expansion output all confirm that /dev/sda is indeed (hd0), and root is definately (hd0,0). By the way, I also verified that /dev/sda1 is bootable, and that /dev/sdb1 is not bootable. Now, when I boot the system, instead of getting a grub stage 2 error, I get a grub stage 1.5 error, even after additionally trying: grub> root (hd0,0) grub> setup --stage2=/boot/grub/stage2 (hd0) grub> quit Is there a way to also specify stage1.5's location? Is there any way to make it so GRUB doesn't realize the add-in card is installed? Remember that it works when the add-in card is not installed. Does anyone know what the problem is? My setup is On-Board Raid: /dev/sda (18GB Mirror) /dev/sda1 = /boot /dev/sda2 = / External SATA Raid: /dev/sdb (1.4 TB Raid5) (unassigned) CD-Rom /dev/hda I have this question on various message boards where people have weighed in, but I still lack a fix, but just in case it helps: - http://www.fedoraforum.org/forum/showthread.php?t=48203 - http://www.linuxquestions.org/questions/showthread.php?s=&threadid=303265 - http://techreport.com/forums/viewtopic.php?t=28285 - http://www.hardforum.com/showthread.php?t=881340 - http://episteme.arstechnica.com/eve/ubb.x/a/tpc/f/96509133/m/782001632731
