(In reply to comment #0)
> Created an attachment (id=350) [details] [details]
> OpenSolaris Boot Messages
> 
> I'm running OpenSolaris in VirtualBox (which I supposed could be the culprit
> here). I've added a new virtual disk and then added that disk to my pool using:
> 
> pfexec zpool add rpool c4d1s0
> 
> Everything appears fine. zpool status shows the new device in rpool and zpool
> list shows the additional capacity gained. However, upon reboot I get several
> messages concluding with the error:
> 
> Error 16: Inconsistent filesystem structure
> 
> This error is consistently repeatable. A screen shot all the boot messages is
> attached. Is there something I've done incorrectly?


As far as I know, zfs boot currently only supports single disk zpool and 
mirrored zpools. Striped (our case) or raidz pools are not supported for
booting.

    http://opensolaris.org/os/community/zfs/boot/zfsbootFAQ/

I believe the ZFS team has implemented protections against misconfiguring the
root pool in bug 102 or 103, which will come out just a little after the
2008.11 release (unfortunately).

I meant "build 102 or 103", not "bug".

In order to get the attention of the Sun kernel engineers, I've
opened a bug in the Sun Bugster database, and am closing this one
as TRACKEDINBUGSTER.

If you'd like me to add you to the cc: of the Bugster bug, just
let me know (by adding a comment to this bug).

Thanks.

I added this comment to the bugster version:

----
I've seen this when using VBox's expanding storage on-disk form,
rather than a fixed-size fully allocated VDI. 
Could you share your vbox config for the old and new storage please?
----

(In reply to comment #5)
> I added this comment to the bugster version:
> 
> ----
> I've seen this when using VBox's expanding storage on-disk form,
> rather than a fixed-size fully allocated VDI. 
> Could you share your vbox config for the old and new storage please?
> ----

Bug 6774616 "GRUB/ZFS Error 16 (Inconsistent filesystem structure) due
to lack of GANG Block support" could be another source for the error 16.
(Fixed in snv_106 or newer)