Re: Failure to boot after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2"

From: Einar Indridason <einar.indrida_at_gmail.com>
Date: Fri, 01 May 2026 12:15:49 UTC 
On Fri, 1 May 2026 at 06:19, Johan Helsingius <julf@julf.com> wrote:

> On 30/04/2026 9:46 pm, Daniel Tameling wrote:
> > Google suggests that your bootloader doesn't support the features of the
> root partition. Did you perhaps do a "zfs upgrade"? You need to boot from
> external medium and update the bootloader.
> >   Depending on whether you use UEFI or Bios the steps differ.
>
> Thanks - yes, I managed to solve the issue. Booted up on an installer
> USB stick, mounted the zfs filesystem, and did an update/upgrade.
>
>         Julf
>
>
Is there a way to check a running 14.4 system (upgraded from 14.3) if that
ZFS filesystem needs to run a "zfs upgrade" ?  Is there some ... "zfs
show-needs-update"

Thanks in advance,
--
EinarI