gptzfsboot problem - anyone awake

Fabian Keil freebsd-listen at
Mon Mar 23 09:59:35 UTC 2015

Per olof Ljungmark <peo at> wrote:

> FBSD 10-STABLE and a Proliant P410 controller
> Rebuilt world and kernel last night, rebooted tonight:
> gptzfsboot: error 1 lba 32
> gptzfsboot: error 1 lba 1
> gptzfsboot: No ZFS pools located, can't boot
> As the boot problem with this controller was known when we installed it
> we have two logical drives and boots from the second to get around it.
> The box has been upgraded several times during the last four months with
> out a problem.

Has the gptzfsboot been updated as well or could it have gotten corrupted?
> I tried to boot from a memstick with latest 10-STABLE (r280048)
> > load /boot/kernel/kernel
> > load /boot/kernel/opensolaris.ko
> > load /boot/kernel/zfs.ko
> > set vfs.root.mountfrom="pool-name"
> > boot
> But that produced a panic
> panic:mountroot: unable to (re-)mount root
> Ideas anyone? I'm out of them just now...

To boot from a ZFS root, the vfs.root.mountfrom value should
start with "zfs:".

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