xen and zfs: no boot because of changed device

[Alex Povolotsky]

Hello!

I'm trying to set up FreeBSD 9.0/amd64 pure-zfs server on xen. I've 
built XENHVM kernel... and cannot boot after that.

/dav/ada0 drive is missing, and zfs expects /dev/ad0 (even when I user 
gpart label). I have no way to edit zpool.cache or alter zpool 
information about drive.

Am I bound to UFS on xen?

And is it possible to use DVD-ROM in xen with XENHVM kernel?

Alex