On Wed, Aug 17, 2016 at 02:09:02PM +0200, karl@??? wrote:
> Henrik Boom:
> > On Tue, Aug 16, 2016 at 10:05:12PM +0200, karl@??? wrote:
> ...
> > > Next scenario is if you have the bootloader on a different media, say
> > > e.g. a floppy. Then, will lilo load the kernel from disk 2 when disk 1
> > > fails (assuming mirrored /boot) ? Do grub handle that ?
> >
> > I boot from a floppy.
> > boot=/dev/fd0
>
> Yes, I remembered that, so I choose floopy as an example hooping to
> hear from your experience.
>
> > And for root I specify
> >
> > root = "UUID=9ce657a4-6b9b-4aa3-8d46-8977164db98a"
> >
> > SO if one hard drive of my RAID1 fails it still recogizes the other.
>
> Well, that is a kernel issue, not a bootloader one.
>
> The question are (I think):
>
> . if the usual boot disk gives read errors,
> should the bootloader try the "next" disk
>
> . should the bootloader in some way verify the kernel and try
> "next" entry/disk if invalid
>
> any more ?
>
> > I use the older protocol for marking RAIDs that puts the RAID
> > signature at the end of the partition instead of the start, so that
> > LILO doesn't have to know about it.
>
> I don't understand this. My understanding of lilo is that is just finds
> the blocks where the kernel is, and usually the kernel file is not placed
> in any superblock or signature; shouldn't the file system driver ensure
> that ?

It has to find the partition with the kernel first. If I understand
correctly, its block numbers are relative to the start of the partition.

It's time to find someone who really knows. Where does it store its
table of block numbers, for example?

-- hendrik

>
> ...
> > Is there a way to tell lilo to boot from a hard disk with grub on it?
> > Is there a way to tell grub to boot from a lilo installation?
>
> Isn't that what the chainloader is for ?
> Like when dualbooting MS-Windows and Linux.
>
> Regards,
> /Karl Hammar
>
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