>Number: 160706
>Category: misc
>Synopsis: zfs bootloader fails when a non-root vdev exists on a slice
>before the root slice
>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: Tue Sep 13 14:00:20 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Peter Maloney
>Release:
>Organization:
Brockmann Consult
>Environment:
FreeBSD 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 02:41:51 UTC 2011
r...@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
zfs bootloader fails when a non-root vdev exists on a slice before the root
slice
>How-To-Repeat:
gpart create -s gpt da0
gpart add -b 34 -s 64k -t freebsd-boot da0
gpart add -s 512M -t freebsd-swap -l swap0 da0
gpart add -s 4G -t freebsd-zfs -l log0 da0
gpart add -s 170G -t freebsd-zfs -l cache0 da0
gpart add -t freebsd-zfs -l root0 da0
gpart bootcode -b /mnt2/boot/pmbr -p /mnt2/boot/gptzfsboot -i 1 da0
zpool create zroot mirror gpt/root0 gpt/root1
glabel label da1 tank1d1
..
glabel label da<x> tank<y>d<z>
zpool create tank \
raidz2 label/tank1d1 label/tank1d2 ... \
raidz2 ...
At this point the system works fine. And survives rebooting.
zpool add tank cache gpt/cache0 gpt/cache1
zpool add tank log mirror gpt/log0 gpt/log1
Now if you boot the system, you get an screen looking like:
=========================
-
FreeBSD/x86 boot
Default: tank:/boot/kernel/kernel
boot:
|
FreeBSD/x86 boot
Default: tank:/boot/kernel/kernel
boot: _
=========================
I have screenshots (which I plan to attach to this report if such a button
appears after submitting it). And a note about the screenshots, the shell looks
broken as a side effect of editing the installer iso file. I only added scripts
and the mps driver to it. And the same problem happens without my changes in
FreeBSD-8.2-RELEASE and FreeBSD-8.2-STABLE-201105.
FYI:
I used mirrors, and installed FreeBSD using this guide, and added things such
as the cache and log slices.
http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror
>Fix:
Fix unknown...
Probably a source code change is needed somewhere in sys/boot/zfs.
Possibilities could be:
- retry the same loop/scan again skipping failed zfs pools
- skip zfs vdevs/pools that have no /boot directory
- skip log and cache vdevs (which I guess would be only a workaround and
specific to my case)
Workaround: Make sure your bootable system is the first zfs slice on your boot
disk.
eg.
gpart add -b 34 -s 64k -t freebsd-boot da0
gpart add -s 512M -t freebsd-swap -l swap0 da0
gpart add -s 80G -t freebsd-zfs -l root0 da0
gpart add -s 4G -t freebsd-zfs -l log0 da0
gpart add -t freebsd-zfs -l cache0 da0
(where root0 is the zfs root slice)
>Release-Note:
>Audit-Trail:
>Unformatted:
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