Help - proxmox not booting, boots to grub rescue

[sporking]

Hi all

At some point today my server must have died or restarted, because now when booting it just prompts me with grub rescue

https://pve.proxmox.com/wiki/Recover_From_Grub_Failure

I've tried following the instructions from here but firstly, there's no sudo, but everything seems to be root anyway, and secondly
sudo mount /dev/sda1 /media/RESCUE/boot gives me the error of "unknown filesystem type zfs_member"

I think this is because sde1 should be my boot device, as I have a raid10 and a separate drive of just proxmox itself, which I think is sde1
But trying sudo mount /dev/sde1 /media/RESCUE/boot gives me "wrong fs type, bad option, bad superblock on /dev/sde1, missing codepage or helper program or other error", which means absolutely nothing to me

I don't know if it's relevant, but I can mount sde2 ,and in there there's an EFI folder, in that there's BOOT and proxmox, and inside the BOOT is a BOOTx64.efi, but I don't know what I'm looking for to be honest, and even if I did, I don't know how to say "grub, boot this"

I've tried going through the instructions, changing sda1 to sde2 but

When I chroot /media/RESCUE it gives me "failed to run command '/bin/sh': No such file or directory"
If I try update-grub I get /usr/sbin/grub-probe: error: failed to get canonical path of 'none', I assume from the error above
And if I try grub-install /dev/sde I get grub-install: error: failed to get canonical path of 'none' again

I am an absolute amateur when it comes to grub, my go to when this has happened with linux installs before is flatten it and start again but I don't think that'll be an option here?

Thanks

 

[Lueghi]

Last week I had exactly the same problem with the same following error messages. I had to reboot my system and the result was grub rescue.

Unfortunatly I can't give some hints because I haven't solved my problem. And I don't know if the linked article ist still relevant for the actual pve release.

Let's hope we get an solution ....

 

[Ansy]

The same problem after update and reboot.
One server was fixed by changing boot via EFI in BIOS settings... but another one hasn't UEFI and can't boot, stops at grub rescue>
No solution found here, Proxmox VE is fully on ZFS mirror. Need help too.
May be zpool upgrade and zfs set compression=zstd have make some trouble?

 

[Lueghi]

I would prefer to do all communication to this problem in one thread. My proposal is this thread because one of the staff member has already answered there.

Stefan