>Number:         183328
>Category:       misc
>Synopsis:       freebsd-update upgrade from 9.1 to 9.2 for zfs on root results 
>in unbootable system
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Oct 26 10:10:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     daniel schütze
>Release:        9.1
>Organization:
>Environment:
FreeBSD storage1 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 
09:23:10 UTC 2012 [email protected]:/usr/obj/usr/src/sys/GENERIC  
amd64

>Description:
A HP ProLiant MicroServer Gen8 had FreeBSD 9.1 successfully installed on it 
with root on zfs following the instructions here

http://wp.strahlert.net/wordpress/zfs-2/installing-freebsd-9-1-using-root-on-zfs-and-gpt-disks/

In short a pair of sata disks in mirror array.

The server was running fine but needed to be relocated so at that point the 
FreeBSD-update command was run to upgrade to 9.2

On attempting to reboot the system stopped at the "OK" prompt (of one of the 
zfs boot loaders) stating the kernel was not found.  There was also an error 
reported that no disk could be found to boot from and lsdev listed no devices 
of any sort.

It appears another person was having the exact same problem
http://forums.freebsd.org/showpost.php?p=234988&postcount=3
>How-To-Repeat:
I have not attempted to repeat the problem.
>Fix:
I put the bootcode from FreeBSD 9.2 on the disks "just in case" but this made 
no difference.

I was not able to fix the problem but I was able to rescue the system by 
booting from a 9.2 loaded memory stick, and running FreeBSD-update rollback 
which successfully restored the system to 9.1 and allowed it to boot.

>Release-Note:
>Audit-Trail:
>Unformatted:
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