Help booting FreeBSD with a ZFS root filesystem

krad kraduk at
Wed Jan 27 21:59:50 UTC 2010

2010/1/27 Ross Penner <ross.penner at>

> On Tue, Jan 26, 2010 at 7:39 AM, Randal L. Schwartz
> <merlyn at> wrote:
> >>>>>> "Ross" == Ross Penner <ross.penner at> writes:
> >
> > Ross> That seems to have been the problem.
> >
> > Yes, what I learned the hard way is that every single step there needs to
> be
> > precisely followed, without deviation, even if you don't understand it or
> > think it's important. :)
> Yes! But because I was extra anal retentive this time around, I've run
> into some more trouble. I have 2 disks and I only added one when I
> created the zroot pool. Now that my system is booted I figured I could
> just go 'zpool add -f zroot /dev/gpt/disk1' but I get the error
> message: "cannot add to 'zroot': root pool cannot have multiple vdevs
> or seperate logs".
> I prepared the second disk in a similar manner to the first: "gpart -t
> freebsd-zfs -l disk1 ad6".
> Any advice would be greatly appreciated!

u need to attach the drive create a mirror, adding creates a new vdev ie
creates a stripe aka raid0

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