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From: Adam McDougall <mcdouga9@egr.msu.edu>
Subject: Re: kern/179814: mountroot fails with error=19 under Xen on 9-STABLE
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The following reply was made to PR kern/179814; it has been noted by GNATS.

From: Adam McDougall <mcdouga9@egr.msu.edu>
To: bug-followup@FreeBSD.org, hugo@barafranca.com
Cc: "Justin T. Gibbs" <gibbs@FreeBSD.org>
Subject: Re: kern/179814: mountroot fails with error=19 under Xen on 9-STABLE
Date: Fri, 21 Jun 2013 11:13:17 -0400

 The cause is r251973 which MFC'ed r251175:
 
   svn rev 251175 Author:gibbs Date:2013-05-31T04:43:19.944993Z
   ==============
   Apply the ad* => ada* IDE device name transition to the Xen block
   front driver.
 
   Submitted by:	Bei Guan <gbtju85@gmail.com>
   Reviewed by:	gibbs
   MFC after:	1 week
 
 
 To prevent people running into the same issue as you, I think the kernel
 needs to make compat /dev/ad* device entries so it does not trip people
 up like this.  In the meantime you can update your fstab before
 rebooting to use /dev/ada*, which ideally people should do anyway.  This
 is probably deserving an entry in UPDATING too, either way.
 I've been meaning to bring this up but I've been busy.  My systems use
 ZFS which won't care, but the change as-is will probably affect my
 installation procedures.