Bruce, I've just rebuilt  *.debs  for 4.0.1-rc4 with now problems. I tested  on the most recent mercurial as well. root@ServerLDX:/usr/src/xen-4.0-testing.hg# patch -p1 -s -i ../fsimage-zfs-24.patch1 root@ServerLDX:/usr/src/xen-4.0-testing.hg# Wouldn't it be a fare for you :- -------------------------------------------------------------------------------------------------------------------- root@ServerLDX:~# dpkg -l '*xen*'|grep "^ii" ii  libxen4                4.0.1rc4-0ubuntu1     library interface for Xen, a Virtual Machine ii  libxen4-dev         4.0.1rc4-0ubuntu1     headers for Xen, a Virtual Machine Monitor ii  linux-image-2.6.32.16-xen    2.6.32.16-xen-10.00.Custom    Linux kernel binary image for version 2.6.32 ii  python-xen-4.0    4.0.1rc4-0ubuntu1     python bindings for Xen, a Virtual Machine M ii  xen-docs-4.0       4.0.1rc4-0ubuntu1     documentation for XEN, a Virtual Machine Mon ii  xen-hypervisor-4.0     4.0.1rc4-0ubuntu1   The Xen Hypervisor for i386 and amd64. ii  xen-utils-4.0         4.0.1rc4-0ubuntu1   XEN administrative tools root@ServerLDX:~# xm info host                   : ServerLDX release                : 2.6.32.16-xen version                : #1 SMP Sat Jul 10 13:11:11 MSD 2010 machine                : x86_64 nr_cpus                : 4 nr_nodes               : 1 cores_per_socket       : 4 threads_per_core       : 1 cpu_mhz                : 2833 hw_caps                : bfebfbff:20100800:00000000:00000940:0408e3fd:00000000:00000001:00000000 virt_caps              : hvm total_memory           : 8190 free_memory            : 1671 node_to_cpu            : node0:0-3 node_to_memory         : node0:1671 node_to_dma32_mem      : node0:809 max_node_id            : 0 xen_major              : 4 xen_minor              : 0 xen_extra              : .1-rc4 xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler          : credit xen_pagesize           : 4096 platform_params        : virt_start=0xffff800000000000 xen_changeset          : unavailable xen_commandline        : cc_compiler            : gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) cc_compile_by          : root cc_compile_domain      : cc_compile_date        : Fri Jul 16 18:35:17 MSD 2010 xend_config_format     : 4 I loaded NexentaStor 3.0.2 via pygrub afterwards ( b134 ZFS 24) root@ServerLDX:~/NexentaStor-Community-3.0.2# xm create -c nexentastor-community-3.0.2-xen.cfg Using config file "./nexentastor-community-3.0.2-xen.cfg". Started domain NexentaStor-3.0.2 (id=1)                                        v4.0.1-rc4 chgset 'unavailable' SunOS Release 5.11 Version NexentaOS_134d 64-bit Loading Kernel... Hostname: myhost Reading ZFS config: done. Mounting ZFS filesystems: (6/6) ZFS Open Storage Appliance (v3.0.2) myhost console login: root Password: Last login: Fri Jul 16 05:58:59 on console nmc@myhost:/$ show network                                                      Option ?  interface ==== Interfaces ==== lo0: flags=2001000849 mtu 8232 index 1         inet 127.0.0.1 netmask ff000000 xnf0: flags=1000842 mtu 1500 index 3         inet 0.0.0.0 netmask 0         ether 0:16:3e:0:0:1 xnf1: flags=1004843 mtu 1500 index 2         inet 192.168.1.5 netmask ffffff00 broadcast 192.168.1.255         ether 0:16:3e:0:0:2 lo0: flags=2002000849 mtu 8252 index 1         inet6 ::1/128 ------------------------------------------------------------------------------------------------------------------- I am attaching the very first MRJ's ZFS 24 patch to the message. It works for me. Try just with xen-4-testing.hg ( tip) Boris. P.S. Send your script to me. --- On Fri, 7/16/10, Thag