[PVE-User] grub-install error: unknown filesystem, won't boot anymore

Wolfgang Link w.link at proxmox.com
Mon Mar 18 10:35:06 CET 2019


Hi Arjen,

thanks for this information.

We update the wiki with your information.

Best Regards,

Wolfgang Link

> arjenvanweelden at gmail.com hat am 8. März 2019 um 21:21 geschrieben:
> 
> 
> Apologies for replying to myself.
> 
> On Fri, 2019-03-08 at 11:12 +0100, arjenvanweelden at gmail.com wrote:
> > Dear readers,
> > 
> > My up-to-date (no-subscription) Proxmox installation at home stopped
> > booting properly. GRUB complains at boot about:
> >   error: no such device: <hex string>.
> >   error: unknown filesystem.
> > 
> > I got my system booting again using a new installation of Proxmox on
> > a USB-stick, because Rescue Boot option of the installation ISO did
> > not
> > work for me. Fortunately, my 4-way mirror rpool is just fine (as are
> > the other ZFS pools), but grub-install, grub-probe, and insmod normal
> > at GRUB prompt keep returning "error: unknown filesystem".
> > 
> > Last thing I did to my rpool was 'zfs set dnodesize=auto rpool' as
> > suggested on the ZFS Tips and Tricks official Wiki-page.
> > Reverting to dnodesize=legacy did not fix the GRUB boot issue.
> > 
> zpool get all rpool shows:
>   rpool  feature at large_dnode  active  local
> 
> I guess this make me run into a GRUB bug?
>   https://savannah.gnu.org/bugs/?func=detailitem&item_id=48885
> If so, suggesting 'dnodesize=auto' on the Proxmox Wiki might not be the
> best idea until the bootloader used by Proxmox supports it?
> 
> > Currently, my system is booting partially from the USB-stick and
> > partially from my original rpool, which works but is not ideal.
> > Does someone recognize this problem? Does anyone know a fix?
> > 
> Is there a way to disable/undo large_dnode?
> 
> kind regards, Arjen
> 
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