Running gpart boot code after upgrade zfs pool to feature flag ?

[Mark Felder]

On Thu, Nov 7, 2013, at 14:45, bsd at todoo.biz wrote:
> Hello, 
> 
> I have just successfully upgraded my server from 9.1 to 9.2 and activated
> the latest feature flag on my zpool. 
> 
> 
> > tube:root 21:04:53 /root # zpool upgrade -a 
> > This system supports ZFS pool feature flags.
> > 
> > Successfully upgraded 'zroot' from version 28 to feature flags.
> > Enabled the following features on 'zroot':
> >   async_destroy
> >   empty_bpobj
> >   lz4_compress
> > 
> > If you boot from pool 'zroot', 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 really don't know if I need to issue this command… 
> 
> I have tried to figure out by reading the man gpart but It is not 100%
> clear to me… 
> 
> My gpart config is as follow : 
> 
> 
> > tube:root 21:11:05 /usr/ports/ports-mgmt/poudriere screen # gpart show
> > =>        34  1677721533  da0  GPT  (800G)
> >           34         128    1  freebsd-boot  (64k)
> >          162           6       - free -  (3.0k)
> >          168     8388608    2  freebsd-swap  (4.0G)
> >      8388776  1669332784    3  freebsd-zfs  (796G)
> >   1677721560           7       - free -  (3.5k)
> > 
> > =>       63  113246145  da1  MBR  (54G)
> >          63  113242122    1  freebsd  [active]  (54G)
> >   113242185       4023       - free -  (2M)
> > 
> > =>        0  113242122  da1s1  BSD  (54G)
> >           0    4194304      1  freebsd-ufs  (2.0G)
> >     4194304    8388608      2  freebsd-swap  (4.0G)
> >    12582912    4194304      4  freebsd-ufs  (2.0G)
> >    16777216   31457280      5  freebsd-ufs  (15G)
> >    48234496   65007626      6  freebsd-ufs  (31G)
> > 
> 
> Shall I run the command provided or not ? 
> 
> 
> >  gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0
> 
> 
> Any help will be welcome since I really don't want to mess up with my
> server. 
> 

Is your root filesystem ZFS or UFS? Based on the disk layouts you have
provided I want to say you probably use ZFS, but I believe it's possible
that you could be booting from da0 and mounting a UFS root from da1
(though I have never tested this type of setup).