mountroot prompt with error2, when trying to boot from a single drive in a 2-way mirror

[Yudi V]

On Fri, Apr 17, 2015 at 2:54 PM, Ricky . <ricky1252 at hotmail.com> wrote:

> From the console images, it would appear that its searching for device
> (ada2p3). I'm assuming that is the device missing and it is expecting it to
> have the guid of ada2p3 before it was missing. Because ada3 is now ada2 it
> is showing the mismatch.
>
You might be right, I will change these to gpt lables and test. But first I
will have to recreate drive I destroyed.

>
>
Did you try to unplug the other one and see if it will boot?
>
> I suggest as switching to gpt labeling.as a work around.
>
> > Date: Fri, 17 Apr 2015 13:36:52 +1000
> > Subject: Re: mountroot prompt with error2, when trying to boot from a
> single drive in a 2-way mirror
> > From: yudi.tux at gmail.com
> > To: freebsd-questions at freebsd.org
>
> >
> > I cleared the label info on /dev/ada2, still same error. And that disk
> > (ada2) became unavailable.
> > gpart show does not even list the disk or it's partitions. I am guessing
> > zpool labelclear -f /dev/ada2 destroyed the partition table.
> >
> >
> > Answer to Ricky's question:
> >
> > No I used geom names (ada2p3).
> > I cannot figure out the reason for the GUID mismatch (see console image).
> > Any ideas?
> >
> > On Fri, Apr 17, 2015 at 4:26 AM, Fabian Keil <
> freebsd-listen at fabiankeil.de>
> > wrote:
> >
> > > Yudi V <yudi.tux at gmail.com> wrote:
> > >
> > > > I checked some popular image hosting websites, could not find any
> that
> > > did
> > > > not use javascript. I can send you the images via email.
> > >
> > > Sure.
> > >
> > > > This is reproducible on a clean install of 9.3 as well. I think it's
> a
> > > bug.
> > >
> > > I think the problem could be that two of the labels from ada2p3 are
> picked
> > > up when looking at ada2 itself. Quoting the gptzfsboot man page:
> > >
> > > | After a disk is probed and gptzfsboot determines that the
> > > | whole disk is not a ZFS pool member, the individual partitions
> > > | are probed in their partition table order.
> > >
> > > Putting the pool on p2 and using p3 for swap would probably work around
> > > this, but given that there's free space behind p3 already, it's not
> > > obvious to me why this wasn't already sufficient.
> > >
> > > > Here's the output of zdb -l /dev/ada2p3
> > > [...]
> > > >
> > > > gpart show ada2 output:
> > > >
> > > > => 34 156301421 ada2 GPT (74G)
> > > > 34 2014 - free - (1M)
> > > > 2048 512 1 freebsd-boot (256k)
> > > > 2560 1536 - free - (768k)
> > > > 4096 8388608 2 freebsd-swap (4.0G)
> > > > 8392704 10485760 - free - (5.0G)
> > > > 18878464 137422848 3 freebsd-zfs (65G)
> > > > 156301312 143 - free - (71k)
> > >
> > > For comparison, no labels are found with this layout
> > > (p3, p4 and p5 are also encrypted, though):
> > >
> > > [fk at kendra ~]$ gpart show
> > > => 40 1250263648 ada0 GPT (596G)
> > > 40 128 1 freebsd-boot (64K)
> > > 168 1880 - free - (940K)
> > > 2048 409600 2 freebsd-zfs (200M)
> > > 411648 8388608 3 freebsd-zfs (4.0G)
> > > 8800256 8388608 4 freebsd-swap (4.0G)
> > > 17188864 1233074816 5 freebsd-zfs (588G)
> > > 1250263680 8 - free - (4.0K)
> > >
> > > [fk at kendra ~]$ zdb -l /dev/ada0
> > > --------------------------------------------
> > > LABEL 0
> > > --------------------------------------------
> > > failed to unpack label 0
> > > --------------------------------------------
> > > LABEL 1
> > > --------------------------------------------
> > > failed to unpack label 1
> > > --------------------------------------------
> > > LABEL 2
> > > --------------------------------------------
> > > failed to unpack label 2
> > > --------------------------------------------
> > > LABEL 3
> > > --------------------------------------------
> > > failed to unpack label 3
> > >
> > > Fabian
> > >
> >
> >
> >
> > --
> > Kind regards,
> > Yudi
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>



-- 
Kind regards,
Yudi