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Re: GRUB troubles with Re: Distinguishing SATA disks

Hendrik Boom wrote:
On Wed, 04 Feb 2009 17:02:18 +0100, Frederik Kriewitz wrote:

On Wed, Feb 4, 2009 at 3:21 PM, Hendrik Boom <hendrik@topoi.pooq.com>
Fun. Lost of symlinks.  Can I use these to identify the drives to be
used in RAID pairs or for LLVM?

Well, that worked.  And /etc/fstab is happy with

/dev/disk/by-id/ata-ST3750640AS-5QD4Z81L-part1 /bottom ext3 defaults,auto,rw,nodev 0 0

but /boot/menu/grub is not happy with

title           Debian GNU/Linux, kernel 2.6.18-6-amd64 (new)
root            /dev/disk/by-id/ata-ST3750640AS-5QD4Z81L-part1
kernel /boot/vmlinuz-2.6.18-6-amd64 root=/dev/disk/by-id/ata-ST3750640AS-5QD4Z81L-part1 ro initrd /boot/initrd.img-2.6.18-6-amd64

Evidently, grub wants a different notation.  The manual grup manual
provides hd and fd notation, but the drives are sd, and, again, how would
grub know which is which?

Grub2 or Grub legacy?

I have that trouble with USB disks, because Legacy wants

root (x,y)

hardcoded, none of that "by-id" stuff.

So I switched to http://stmaarten.globat.com/~supergrubdisk.org/index.php

"super grub disk" that allows me to state in menu.lst:

title           2.6.26-1-686 di install
findf           /wd80_0jd-60.03
root            $(out_device)
kernel /boot/vmlinuz-2.6.26-1-686 root=LABEL=wd80_0jd-60.03 noapic apm=on vga=791 edd=off ddcon-1 network quiet
initrd          /boot/initrd.img-2.6.26-1-686

Key is that "findf", that looks for a file on any disk named "/wd80_0jd-60.03" and uses *that* disk as root. So in your case you would stick a file named /ata-ST3750640AS-5QD4Z81L-part1 on the disk labeled by that and SGD would stick the appropriate (x,y) in "out_device" and away you'd go.

Give that a try.


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