Booting from ZFS raidz

Sergiy Suprun sergiy.suprun at
Wed Jan 6 21:05:54 UTC 2010

Some time ago I follow instruction from this wiki 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> 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_______________________________________________
> freebsd-questions at mailing list
> To unsubscribe, send any mail to "
> freebsd-questions-unsubscribe at"

More information about the freebsd-questions mailing list