Upgrade -> 9.3 Grub error: attempt to read or write outside of disk 'hd0'. - Not booting

[slevin]

HP Microserver. Upgraded from 9.2.9 to 9.3

Boot fails, as soon as grub is started with:

error: attempt to read or write outside of disk 'hd0'.
Entering rescue mode...
grub rescue>


Help :-(

tried:

grub rescue> ls
(hd0) (hdo,gpt2) (hdo,gpt1)

grub rescue> ls (hd0)
(hd0) : Filesystem is unknown

grub rescue> ls (hdo,gpt2)
(hdo,gpt2) : Filesystem is zfs.

grub rescue> ls (hdo,gpt1)
(hdo,gpt1) : Filesystem is unknown.

 

[Caiman]

same here. Update from 9.2.1.8 ->9.3

 

[Henry78]

Happend here (on a Microserver) while upgrading to 9.10. You got any hints how to fix it yet? (Sorry for bumping an old thread)

 

[sigi253]

I had the same issue when upgrading from 9.3.x to 9.3.x on a HP Microserver.

My quickest solution was to "upgrade" freenas onto the broken one. Freenas will keep the settings and it didn't take long to do so.

For clarification: You just install freenas onto your install medium again. The installer will preserve the settings. Don't forget to make a backup before you do it (if you care enough about your settings)