On 10/17/07, Jack Howarth <howarth@xxxxxxxxxxxxxxxxx> wrote: > I ran into an interesting problem which I wonder if > anyone has some insights into. The motherboard on a > i386 Fedora 7 workstation died recently and we hoped that > the existing SATA RAID-1 mirror could be moved into a > new workstation using an opteron processor. The machine > could find the MBR to start the boot process but couldn't > find the md partitions to complete the boot. Interestingly > booting i386 Fedora 7 in linux rescue mode presented no > problem in mounting the same md partitions. The only > difference I noticed was that the new motherboards BIOS > showed a channel 0 with the IDE devices (DVD+/-RW) and > a channel 2 and 3 with the two SATA drives. However under > the linux rescue mode the two SATA drives appeared to be > mounted the same (as sda and sdb). I am rather puzzled > as to what aspect of the RAID-1 configuration could be > causing the transplant of the RAID-1 mirror to fail. > Jack > ps I eventually transfered the data off the drive and > started with two new SATA drives with x86_64 Fedora 7 > although I realize I probably could have chrooted the > sysimage under i386 Fedora 7 and reinstalled grub > on the MBR. > > -- I've noticed this before in a dell workstation. The Bios controls the order in which the disk subsystems are found. Ie, does it have internal sata, internal hd, and external usb in a certain order. I can change that. But when I boot off the cd rom, it ignores that bios ordering, and finds devices as it wants to. To stop it from calling the internal ide drive /dev/sda, I had to use the bios to make it read the sata drives first as /dev/sda and /dev/sdb, and the ide device gets pushed to the end of the alphabet. using the scsi drivers for all devices (ide and sata) is not a very good system when a computer has both sata and ide devices. most systems don't have both, so most users don't encounter it/ -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas
