Keld Jørn Simonsen wrote:
# grub
grub> device (hd0) /dev/hdc
grub> root (hd0,0)
grub> setup (hd0)
I do not grasp this. How and where is it said that two disks are
involved? hda and hdc should both be involved.
There are not two disks involved in this instance.
This is used in the scenario where the primary disk in the RAID1
(/dev/hda), already has grub installed in the MBR and you wish to
install it on the secondary drive (/dev/hdc).
This then allows for a failed primary drive to be removed and the
machine to boot from the secondary - (may need BIOS to be set to boot
from secondary drive).
As an aside, after last weeks discovery that the Fedora 8 install had
not installed grub on the secondary drive, as part of a RAID 1 install,
some cursory Googling and searching Redhat's Knowledge base leads me to
believe that this may well be normal for all Redhat (RHEL/Fedora) RAID1
installs.
One has nothing to lose by installing grub on the second drive in this
case and it may save some delay in recovery on losing the primary,
although as has been pointed out, it is best practice to test missing
drives as part of initial install testing.
Regards,
Richard
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