On 2/28/07, Scott Silva <ssilva at sgvwater.com> wrote: > James Olin Oden spake the following on 2/28/2007 9:27 AM: > > On 2/28/07, Scott Silva <ssilva at sgvwater.com> > > wrote: > >> CM spake the following on 2/28/2007 5:40 AM: > >> >> IIRC, you also have to do some special magic with the grub config to > >> >> make the machine boot nicely even if you have to reboot with one drive > >> >> > >> >> down. Unfortunately, it's been a while since last time I did this, so > >> >> I can't remember. > >> >> > >> >> -- > >> >> Haakon Gjersvik Eriksen -- Basefarm AS > >> > > >> > Presuming sda first HDD, sdb second HDD, first partition (0) is /boot > >> > > >> > grub > >> > device (hd1) /dev/sdb > >> > root (hd1,0) > >> > setup (hd1) > >> > > >> > CM > >> > > >> I'm confused. Wouldn't you want "root (hd0,0)" > >> because if the first drive fails, the second drive will become sda > >> after boot. > >> > > As I understand it the first drive does not become sda/hda after boot > > in all cases. At least with IDE drives it will always stay where it > > is based on controller and master/slave relationship. Beyond this, > > though, when specifying "root" for the setup command grub taking the > > drive in the context of how the BIOS has mapped who is the 0th, 1st, > > 2nd and so on, with a simple transform provided by your > > /boot/grub/device.map file. At least this is what I believe to be the > > truth. > > > > ...james > IDE drives will stay where they are, but scsi and sata drives will move based > on (for scsi) device id, and for sata would be a crap shoot but maybe by port > (probably bios, driver, and controller dependent). > > But with an IDE drive, the slave might not be able to function unless the > failed master is physically removed. If all drives are a master on their > controller, it would be much better. > That sounds like what I recall. so seriously, say have two drives mirrored, and you wish the machine to boot without intervention if one of the drives goes, is their a right grub configuration for each of the drive types (ide, sata, scsi) and is it identical between each of the drive types are different? I figure once your booted your fine because of UUID's. Thanks....james