Re: how to tell where it booted from

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time to reminisce.

On 02/17/16 22:11, Tim wrote:
> Tim:
>>> Once you sort this out, you want to plan how you do multiboots in the
>>> future.  Way back when I tried it, and even two is a pain, one good
>>> solution was to make your own custom boot partition, and all it did was
>>> let you select which partition to boot, it chainloaded the next one.
> 
> Mike Wright
>> That sounds like the ideal approach for what I do.  Do you have an 
>> example of that you'd be willing to share?  I've never used chain 
>> loading and have only seen it referenced on this list.
> 
> Back in the old GRUB 1 days, that was easy enough.  And I suppose you
> could install a version 1 bootloader onto a single /your/ boot
> partition.  It'd be left alone by your installs.
> 
> This is from a very old system, which had an entry to chainload from a
> floppy disk.  By using a hd0 instead of fd0 entry, or whatever drive and
> partition number pertained to the partition that you wanted to boot, you
> could chainload to another hard drive:
> 
> title Fedora Core (2.6.17-1.2142_FC4)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.17-1.2142_FC4 ro root=LABEL=/ acpi=force
>         initrd /initrd-2.6.17-1.2142_FC4.img
> 
> title Boot from floppy disk drive
>         lock
>         rootnoverify (fd0)
>         chainloader +1
> 
> 'twas as simple as that.  I'm far from impressed by the incomprehensible
> mess that GRUB 2 is.
> 
> 
>> I use a very similar approach.  Since a lot of my installs are intended 
>> to be run in a custom Xen environment they can't even single boot but I 
>> still need the kernels and initrds to copy elsewhere.  The problems 
>> arise when the installer does what it thinks is best for me and starts 
>> screwing with my LVM setup or goes scarfing through all my disks 
>> creating boot stanzas for installations that are incapable of standalone 
>> boots.  Gets really big and really ugly really fast.  I have had much 
>> better luck with Ubuntu installers.
>
> I think there were options to not probe for other systems.  But I
> haven't done an install for ages.
>
> Of course, if you're going to dedicate an entire hard drive to an
> installation, the simple solution is to unplug the others while
> installing.  Or, disable their port in the BIOS, temporarily, so they're
> not found.
>
> Personally, I favoured dedicating whole drives to an install, rather
> than partition.  There's a few advantages:  More space for it to use.
> Very easy to unplug to disable, archive, or transfer.  Since I don't
> install bi-annually, I used to get a new drive for a new install, and
> try it out independent from prior installs, with it as the sole drive.
> If it hoses anything, it only does itself.  The old drive gets
> connected, later, data copied over, and the old drive left as an
> archive.
>
> I never seemed to get a collection of un-used drives, though.  It's
> never long before one gets put into a completely new box, or replaces
> another drive that's knackered.
>
.
gone are the 'good old days' of boxes 4 and 5 5" drive bays where one could
install install 3" drives in removable drive carriers and swap drives.


-- 
peace out.

If Bill Gates got a dime for every time Windows crashes...
 ...oh, wait. He does. THAT explains it!
-+-
in a world with out fences, who needs gates.

CentOS GNU/Linux 6.7

tc,hago.

g
.

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