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From: no.top.post on 4 May 2010 05:04
No not chroot.

I've got a hdd[A] which is set up to run: root = /hda2 & /usr = hda9
and another hdd[B] set to run root = hda6.

Since they are both set-up to run as hdaX, I have to unplug to swap and boot the
other.
I'd like to just have a script which renames the few files which will
allow me to run hdd[A] as root = /hdb2 & /usr = hdb9:
like mv <set of files> <set of filesA2B>.

And of course I'll have a 'matching' script to restore the 'original' files.

So which are the files ?
/etc/fstab, /etc/mtab and what else ?

== TIA.

PS. hdd[B] is kernel 2.4 and boots from fd0 &
hdd[A] is kernel 2.6 and boot from its grub,
so AFAICS I'd have to leave hdd[A] and 'move' hdd[B] since
I don't want to have to mess with grub, but it's easy to
manually enter the 'root-arg' for the fd0 booter -- which I
already do at present.

PSS. I guess it is possible to run the hdd[B] [kernel 2.4] from
the hdd[A]'s grub ?
And then what about booting the hdd[B] via the 2.6 kernel's
zlinuz & initrd ?


From: Anton Ertl on 4 May 2010 06:56
no.top.post(a)gmail.com writes:
>No not chroot.
>
>I've got a hdd[A] which is set up to run: root = /hda2 & /usr = hda9
>and another hdd[B] set to run root = hda6.
>
>Since they are both set-up to run as hdaX, I have to unplug to swap and boot the
>other.
>I'd like to just have a script which renames the few files which will
> allow me to run hdd[A] as root = /hdb2 & /usr = hdb9:
>like mv <set of files> <set of filesA2B>.
>
>And of course I'll have a 'matching' script to restore the 'original' files.

Why would you need to rename and restore files. You have two
/etc/fstab files, one on each root. You just set up the /etc/fstab on
each root to be correct for the system.

The other thing you need to do is to configure the boot loader to have
options for two different roots.

>PS. hdd[B] is kernel 2.4 and boots from fd0 &
> hdd[A] is kernel 2.6 and boot from its grub,
> so AFAICS I'd have to leave hdd[A] and 'move' hdd[B] since
> I don't want to have to mess with grub, but it's easy to
> manually enter the 'root-arg' for the fd0 booter -- which I
> already do at present.

Ok, that's even easier, although it's pretty easy to set up grub to
boot two different kernels with different roots, too.

>PSS. I guess it is possible to run the hdd[B] [kernel 2.4] from
>the hdd[A]'s grub ?

Usually yes.

- anton
--
M. Anton Ertl Some things have to be seen to be believed
anton(a)mips.complang.tuwien.ac.at Most things have to be believed to be seen
http://www.complang.tuwien.ac.at/anton/home.html
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