James Olin Oden spake the following on 2/28/2007 9:27 AM:
On 2/28/07, Scott Silva ssilva@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.