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

On Fri, May 01, 2026 at 12:15:49PM +0000, Einar Indridason wrote:
> 
> 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

zfs upgrade only enables new features that weren't supported before. If you don't want to use these features, there is no benefit in upgrading. Given that the worst case scenario is that the system won't boot afterwards, I upgrade my pools only very rarely.

Best regards,
Daniel