Booting from ZFS raidz

[Anselm Strauss]

On Jan 8, 2010, at 17:12 , krad wrote:

> 2010/1/8 Anselm Strauss <amsibamsi at gmail.com>
> Sorry, forgot the list ...
> 
> ---------- Forwarded message ----------
> From: Anselm Strauss <amsibamsi at gmail.com>
> Date: Fri, Jan 8, 2010 at 4:50 PM
> Subject: Re: Booting from ZFS raidz
> To: Sergiy Suprun <sergiy.suprun at gmail.com>
> 
> 
> I've done some experiments with the 8.0 stable branch and the head branch
> from SVN. I just recompiled /boot/loader but didn't have any luck. The
> version from the stable branch gives me the exact same error, the head
> version fails with a new error. Doesn't seem this is really ready at the
> moment. I think I'll go with a separate mirror pool for now.
> 
> Anselm
> 
> 
> On Wed, Jan 6, 2010 at 9:43 PM, Sergiy Suprun <sergiy.suprun at gmail.com>wrote:
> 
> > Hi.
> > Some time ago I follow instruction from this wiki
> > http://wiki.freebsd.org/RootOnZFS and I had a problem like yours.
> > After some experiments I build loader from CURRENT, and boot fine from
> > raidz2 zpool. I don't know, may be now this code avialable in 8-STABLE.
> >
> > On Wed, Jan 6, 2010 at 20:25, Anselm Strauss <amsibamsi at gmail.com> wrote:
> >
> >> Hi,
> >>
> >> I'm experimenting with a ZFS only system and booting from it in
> >> VirtualBox. Thanks to various mails and forum posts from the net I have a
> >> working scenario with booting from a ZFS mirror. However, I can't get the
> >> thing to work with raidz with the exactly same setup, except that the pool
> >> is now raidz instead of mirror and there is one more disk. I feel sure I
> >> have all the stuff with partitioning, boot loader installation, etc. right.
> >> I tested this with version 8.0-RELEASE on 64bit.
> >>
> >> Now, before I go into detailed explaining, is raidz really supported? I
> >> always get the following error after it says "FreeBSD/i386 bootstrap loader,
> >> Revision 1.1":
> >>
> >> ZFS: i/o error - all block copies unavailable
> >> ZFS: can't read MOS object directory
> >> (repeats a lot)
> >> Can't find root filesystem - giving up
> >> can't load 'kernel'
> >>
> >> I think the "MOS" message comes from zfs_mount_root() in
> >> /usr/src/sys/boot/zfs/zfsimpl.c. I asume that is the point when /boot/loader
> >> has been loaded and now wants to load the kernel into memory. After that
> >> error I'm in the loader prompt. When I try to load any file I always get the
> >> same error as above.
> >>
> >> Anyone any ideas?
> >>
> >> Thanks,
> >> Anselm_______________________________________________
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> >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
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> >>
> >
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> 
> you didnt export the pool at any point did you without reimporting it and copying the zpool.cache?

I created /boot/zfs, exported the pool, imported again, copied /boot/zfs/zpool.cache to /zroot/boot/zfs, unmounted /zroot and then set the mountpoint for zroot to legacy. After the loader lists 3 disk drives I'm now getting the error:

FATAL: int13_harddisk: function 42. Can't use 64bits lba

Then, booting stops completely, no command prompt follows. This is with the SVN head branch.