Re: Why does not update-grub detect Fedora 13 installation?

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On 07/12/2010 11:39 AM, H.S. wrote:
> On 12/07/10 01:42 PM, Rick Stevens wrote:
>>
>>
>> /dev/sdc5 is an extended partition.  IIRC, update-grub only checks
>> primary partitions--primarily because your BIOS can't boot anything in
>> an extended partition, either.
>
> hmm .. then why does it detect OSes on my LVM volumes? I don't think
> BIOS can boot from an LVM volume, can it?
>
>
> Also, among the other OSes it detected on my system, here are a couple
> of counter examples:
> --------------------------------------------------
> menuentry "Debian, with Linux 2.6.32-100601-1394 (on /dev/sdc6)" {
>          insmod part_msdos
>          insmod ext2
>          set root='(/dev/sdc,msdos5)'
>          search --no-floppy --fs-uuid --set
> 9db23921-b7bc-4f1f-8b31-306f2126af0e
>          linux /vmlinuz-2.6.32-100601-bijli-1394
> root=UUID=0300e89b-ae92-43f5-b1f0-0d53c2b589ca ro vga=792 quiet
>          initrd /initrd.img-2.6.32-100601-bijli-1394
> }
> menuentry "Fedora release 9 (Sulphur) (on /dev/sdc13)" {
>          insmod part_msdos
>          insmod ext2
>          set root='(/dev/sdc,msdos13)'
>          search --no-floppy --fs-uuid --set
> 3cfc63bf-9e84-49a3-90ad-3fa623141200
>          linux /boot/vmlinuz-2.6.26.6-79.fc9.i686 root=/dev/sdc13
> }
> --------------------------------------------------
>
> Both logical partitions.
>
> Besides, I don't think BIOS is booting from the partitions at all on my
> system. It just checks the mbr of sdc, which is set by grub, and the
> computer gets pointed to my /boot partition where vmlinuz continues to
> boot. Isn't that broadly what happens?

Yes, but even though grub can boot /dev/sdc5, I don't think the update
utility you're using to update grub.conf _checks_ extended partitions
to put appropriate entries in the config file.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, C2 Hosting          ricks@xxxxxxxx -
- AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
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-    Reality: A crutch for those who can't handle science fiction    -
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