| View previous topic :: View next topic |
| Author |
Message |
pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
|
 Posted: Mon Nov 24, 2014 6:27 pm Post subject: [SOLVED] root on /dev/md127 will not boot after installation |
 |
|
I just re-installed gentoo on one of my servers. It used to be based upon grub1, and now I'm using grub2. All I observe is
| Code: | Loading Linux 3.16.5-gentoo ...
|
And then nothing more.
I can boot the install CD and mount the filsystem using that kernel without problems. I have also used my previous .config with all the LVM support etc. from my previous kernel build. I have compiled grub2 with the device-mapper use flag. I have also added lvm to the grub preload modules so I observe:
| Code: | ### BEGIN /etc/grub.d/00_header ###
insmod lvm
|
in my /boot/grub/grub.cfg
One difference is that my RAID was shown as /dev/md0 previously, and now it's /dev/md127. So when I run grub2-mkconfig the menuentry will contain:
| Code: | echo 'Loading Linux 3.16.5-gentoo ...'
linux /vmlinuz-3.16.5-gentoo root=/dev/md127 ro
|
How can I debug this? Is it a grub2 problem, or is it a problem with my kernel?
Last edited by pgu on Tue Nov 25, 2014 3:18 pm; edited 1 time in total |
|
| Back to top |
|
 |
pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
|
| Posted: Mon Nov 24, 2014 7:07 pm Post subject: |
|
|
Also added domdadm so my /etc/default/grub now contains:
| Code: | GRUB_PRELOAD_MODULES=lvm
GRUB_CMDLINE_LINUX_DEFAULT="domdadm"
|
Still the same. |
|
| Back to top |
|
|
pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
|
| Posted: Mon Nov 24, 2014 7:11 pm Post subject: |
|
|
| Is it possible to specify the UUID rather than the device when I have the domdadm kernel parameter? |
|
| Back to top |
|
|
pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
|
| Posted: Tue Nov 25, 2014 5:48 am Post subject: |
|
|
| I would assume this is more of a problem of booting the kernel file rather than mounting the md filesystem as I don't get any output from the kernel, only the grub message. |
|
| Back to top |
|
|
pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
|
| Posted: Tue Nov 25, 2014 7:14 am Post subject: |
|
|
http://wiki.gentoo.org/wiki/GRUB2#Configuration says:
| Quote: | | grub2-mkconfig does not work properly with mdraid. Unless you manually fix up the config afterwards you will be left with a non-bootable system! |
What are these manual fixes? I don't have my boot partition on mdraid, only my root. But what are the manual fixes? |
|
| Back to top |
|
|
nativemad
Developer
Joined: 30 Aug 2004
Posts: 918
Location: Switzerland
|
| Posted: Tue Nov 25, 2014 12:11 pm Post subject: |
|
|
Hi,
it's strange that it doesn't show more... What happens if you take a kernelfile that isn't existing?? - Press E to edit the parameters within the grub menu 
Are you sure you need lvm and devicemapper at all, when you use the md device directly as root??
What kind of raid do you have?
I never had luck without an initrd and root on mdraid5/6.....
...If the Kernel doesn't assemble the raid on it's own, then you'll need to help out with mdadm, which is normally within the initrd...
| Code: | | genkernel --mdadm --no-clean --menuconfig all |
That should do it!
And do not forget to add "domdadm" as kernel parameter!! 
HTH, cheers
_________________
Power to the people! |
|
| Back to top |
|
|
pgu
l33t
Joined: 30 Jul 2009
Posts: 721
Location: Oslo, Norway
|
| Posted: Tue Nov 25, 2014 3:18 pm Post subject: |
|
|
The initrd solved the problem. Thanks! For some strange reason I though I did not need it for grub2.
I probably don't need the device-mapper and lvm at all. |
|
| Back to top |
|
|
|
Installing Gentoo
