[PVE-User] ZFS Upgrade...

[Alwin Antreich]

Hi Marco,


September 22, 2025 at 4:21 PM, "Marco Gaiarin" <gaio at lilliput.linux.it mailto:gaio at lilliput.linux.it?to=%22Marco%20Gaiarin%22%20%3Cgaio%40lilliput.linux.it%3E > wrote:


> 
> Someone have some feedback on this? Really i don't understand... Thanks.
> 
> > 
> > We have upgraded our server from PVE6 to PVE8, waited some month to be sure
> >  there's no incompatibilities and now we are ready to remove older kernels,
> >  and upgrade ZFS.
> >  
> >  Current situation is:
> >  
> >  root at svpve3:~# zfs upgrade
> >  This system is currently running ZFS filesystem version 5.
> >  
> >  All filesystems are formatted with the current version.
> >  
> >  and:
> >  
> >  root at svpve3:~# zpool upgrade
> >  This system supports ZFS pool feature flags.
> >  
> >  All pools are formatted using feature flags.
> >  
> >  
> >  Some supported features are not enabled on the following pools. Once a
> >  feature is enabled the pool may become incompatible with software
> >  that does not support the feature. See zpool-features(7) for details.
> >
> 
Did you look into the man page? `man zpool-features`

You can find a list of features compatible with the grub version installed, see /usr/share/zfs/compatibility.d/

If your system is running in EFI mode already, then consider converting to systemd-boot. 

Cheers,
Alwin