Grub failure ZFS

[killmasta93]

Hi,
Currently was wondering whats the current wiki to check this information, Recently i had a grub failure on proxmox legacy mode and i had to format it so i was checking around but really didn't find anything only this wiki but i think its outdated
https://pve.proxmox.com/wiki/Recover_From_Grub_Failure

I did read something about booting proxmox ISO and run in debug mode and import the rpool but not sure whats the next step?


Thank you

 

[wolfgang]

Hi,

this WIKI is not outdated it is for LVM default installation.

instead, lvscan you use the "zpool import"

the rest is the same.

 

[killmasta93]

allright so this is what i have done so far, maybe if this works ill write up a new tutorial so it can get updated on the wiki

zpool import -R /mnt/ rpool
mkdir /media/RESCUE

So these parts how would they apply on zfs?

• sudo mount /dev/pve/root /media/RESCUE/

i tried
mount /mnt/rpool/ROOT /media/RESCUE

but i get is not a block device

as for the /dev/sda1, because its in ZFS i would mount the 2 disks which contains the grub?
im guessing its the /dev/sda2 and /dev/sdb2 which both have size of 512mb

• sudo mount /dev/sda1 /media/RESCUE/boot

and guessing these other parts would be the same?

• sudo mount -t proc proc /media/RESCUE/proc
• sudo mount -t sysfs sys /media/RESCUE/sys
• sudo mount -o bind /dev /media/RESCUE/dev

Thank you

 

[wolfgang]

the problem here is ZFS tries to automount the imported pool.
But as the error message say "/" is not empty.
so you have to change the mount point.

zfs set mountpoint=/media/RESCUE
zfs mount rpool/ROOT/pve-1

after you reinstall grub you have to set the mount point back to "/" and export the rpool

 

[killmasta93]

Thanks for the reply, i somewhat got confused so
these would be the steps at first?

zpool import -R /mnt/ rpool
mkdir /media/RESCUE
zfs set mountpoint=/media/RESCUE
zfs mount rpool/ROOT/pve-1

 

[wolfgang]

Yes this is the first step.
after you have mount the pool to the correct path you can follow the wiki.

 

[killmasta93]

Thanks for the reply,
i tried this

zpool import -R /mnt/ rpool
mkdir /media/RESCUE
zfs set mountpoint=/media/RESCUE rpool

but when i try running zfs mount rpool/ROOT/pve-1
i get cannot open rpool/ROOT/pve dataset does not exist

 

[wolfgang]

Please send the output of this command

zfs get mountpoint,mounted

 

[killmasta93]

thanks for the reply,
im attaching the output

 

[killmasta93]

So i exported the rpool and imported the pool again and this is what i get

 

[killmasta93]

bump? anyone else has accomplished from a grub failure?

 

[RobFantini]

bump? anyone else has accomplished from a grub failure?

try following wolfgang's suggestions at #4

 

[killmasta93]

Thanks for the reply, as at #7 i tried following the commands but then on #9 showed the issue