Re: bootcode update after zpool upgrade

From: Alexander Leidinger <>
Date: Thu, 24 Feb 2022 09:43:22 UTC
Quoting Miroslav Lachman <> (from Wed, 23 Feb 2022  
23:40:42 +0100):

> I did "zpool upgrade tank0" on one of our machines with FreeBSD  
> 12.2-p13 amd64 and then got this message:
> # zpool upgrade tank0
> This system supports ZFS pool feature flags.
> Enabled the following features on 'tank0':
>   large_dnode
>   spacemap_v2
>   allocation_classes
> If you boot from pool 'tank0', don't forget to update boot code.
> Assuming you use GPT partitioning and da0 is your boot disk
> the following command will do it:
>         gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0
> I am not sure what I should update. This machine is EFI boot only  
> (this is the only one EFI machine we have).

> Should I run:
> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 2 nvd0
> gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 2 nvd1

This is the bootcode zpool upgrade talks about.

> Or should I update EFI partitions? (if so, then how?)

The EFI partition contains the loader, not the bootcode.

While we are at it, I'm still looking for the place where I can find  
which features the bootcode supports. Not all features are supported  
for a root pool.


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