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Date: Wed, 27 Jun 2012 22:00:25 GMT
Message-Id: <201206272200.q5RM0PlR099243@freefall.freebsd.org>
To: freebsd-fs@FreeBSD.org
From: George Hartzell <hartzell@alerce.com>
Cc: 
Subject: Re: kern/166566: [zfs] zfs split renders 2 disk (MBR based) mirror
 unbootable
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The following reply was made to PR kern/166566; it has been noted by GNATS.

From: George Hartzell <hartzell@alerce.com>
To: Andriy Gapon <avg@FreeBSD.org>
Cc: hartzell@alerce.com,
    bug-followup@FreeBSD.org
Subject: Re: kern/166566: [zfs] zfs split renders 2 disk (MBR based) mirror
 unbootable
Date: Wed, 27 Jun 2012 14:53:21 -0700

 Andriy Gapon writes:
  > on 27/06/2012 00:38 George Hartzell said the following:
  > > currdev does not seem to have any effect, it looks like something else
  > > is being used to find the initial zfs pool(s).
  > 
  > Just a note that currdev would not affect the order of the pools in lsdev
  > output.  It should affect from which pool the zpool.cache is loaded.
  > 
  > Ah!  You probably need to issue unload command as well.  I keep forgetting that
  > in default configuration loader loads up stuff before presenting its menu.  I've
  > changed my loader.rc, so that nothing is loaded before the menu.
  > 
  > But, yes, the best course of action seems to be to fix up zsplitroot right after
  > splitting it off.
  > 
  > Thank you for your persistence in testing and debugging!
 
 I thought the following would work, but it does not.
 
   zpool split -R /zsplitroot zroot zsplitroot
   zpool status  # shows both pools.
   mount -t zfs zsplitroot /zsplitroot  # my zfs stuff doesn't auto mount
   cp /boot/zfs/zpool.cache /zsplitroot/boot/zfs
   perl -pi.bak -e 's|zfs:zroot|zfs:zsplitroot|' /zsplitroot/boot/loader.conf
   umount /zsplitroot
 
 It fails to mount zsplitroot.  Worse, setting vfs.zfs.debug=1 results
 in no additional output, just that the error is number 2.
 
 Any idea what I'm missing?
 
 g.