Persistent block naming and grub...

chenko · n00b Joined: 17 Dec 2003 Posts: 31

I've only just read into persistent block naming, but im not sure what to do for the grub.conf.

I understand I just put my by-label/ ref in the root= but what about "root (hd0,0)" ?

DONAHUE · Posted: Wed Feb 09, 2011 10:05 pm Post subject:

root (hd0,0) determined by the bios and passed to grub, labels not involved
root=LABEL=yourlabel is a kernel argument and only becomes effective after the kernel is loaded
_________________
Defund the FCC.

chenko · n00b Joined: 17 Dec 2003 Posts: 31

Are there any options then to boot a specific device as the hdX numbers change still dependant on what drives are loaded at the time... ?

DONAHUE · Posted: Thu Feb 10, 2011 3:30 pm Post subject:

with most current BIOS:
If you connect a drive that has a boot loader in its MBR and enter BIOS and select that drive to boot first it will be designated hd0.
With such a BIOS and a grub.conf default menu item containing root (hd0) on each drive attached BIOS would boot the same drive until a different BIOS change was made.
_________________
Defund the FCC.

chenko · n00b Joined: 17 Dec 2003 Posts: 31

Aye you're right - as I was booting from a "Live USB" device, my "boot drive" was changing hdX all the time and I forgot that it would stay as hd0 if booted from as you say.

Based on this I managed to use by-label and even use it in grub, although I had to use initramfs from genkernel very easy once figured out.

So for anyone searching that wants to do the same, this is what I did. Even though I am using my own kernel, I used genkernel to produce my initrd.