Re: Booting from a raid1 device ?

[Luca Berra <bluca@comedia.it>]

On Thu, Oct 30, 2003 at 03:54:48AM +0300, Michael Tokarev wrote:
>  why the hell a boot loader should "mirror" anything to the second disk? :)
>
>That is.  Place standard MBR into the boot sector.  An MBR that will boot
>from active partition.  Be it e.g. /dev/hda and /dev/hdb.  Create raid1
>device from /dev/hda1 and /dev/hdb1.  Mark both partitions as active.
>And install whatever boot loader you want into /dev/md1 - it will be
>mirrored automatically to /dev/hda1 and /dev/hdb1 (and to whatever else
>disks you'll use).
1) are you really mirroring on the same ide controller?
2) whoever told you that the first 512 bytes of a partition are fair
game? lvm uses those, and IIRC xfs does too.

L.
Btw i recall reading somewhere that grub actually modifies the disk it
is booting from if luser wants to change the kernel command line.
I dunno if it is true or not, and i am too lazy to read the source. Can
anyone confirm or deny that?

L.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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