Have you tried recovering the partition table with "gpart recover"?

S.

> On 18 Sep 2015, at 19:41, Michael Reifenberger <m...@reifenberger.com> wrote:
> 
> Hi,
> today I've got my first real xen dom0 error so far:
> 
> I had a 20G zfs volume with windows installed (Windows has the PV drivers 
> installed).
> The disk section of the cfg looks like:
> ...
> disk =  [
>        '/dev/zvol/zdata/VM/win81/root,raw,hda,rw',
>        '/VM/ISO/W81.PRO.X64.MULTi8.ESD.Apr2015.iso,raw,hdc:cdrom,r'
>        ]
> boot="d"
> ...
> 
> 
> This works until shutting down the domU and extending the volume (from 20G) 
> to 40G:
> 
> zfs set volsize=40G zdata/VM/win81/root
> 
> Now trying to start the guest I get:
> 
> (vm)(root) # xl create win81.cfg
> Parsing config from win81.cfg
> libxl: error: libxl_device.c:950:device_backend_callback: unable to add 
> device with path /local/domain/0/backend/vbd/6/768
> libxl: error: libxl_device.c:950:device_backend_callback: unable to add 
> device with path /local/domain/0/backend/vbd/6/5632
> libxl: error: libxl_create.c:1153:domcreate_launch_dm: unable to add disk 
> devices
> libxl: error: libxl_dm.c:1595:kill_device_model: unable to find device model 
> pid in /local/domain/6/image/device-model-pid
> libxl: error: libxl.c:1608:libxl__destroy_domid: libxl__destroy_device_model 
> failed for 6
> libxl: error: libxl_device.c:950:device_backend_callback: unable to remove 
> device with path /local/domain/0/backend/vbd/6/768
> libxl: error: libxl_device.c:950:device_backend_callback: unable to remove 
> device with path /local/domain/0/backend/vbd/6/5632
> libxl: error: libxl.c:1645:devices_destroy_cb: libxl__devices_destroy failed 
> for 6
> libxl: info: libxl.c:1691:devices_destroy_cb: forked pid 2306 for destroy of 
> domain 6
> 
> Since I saw in syslog that GEOM did some auto-moddings of the disk I did:
> 
> `gpart commit zvol/zdata/VM/win81/root` on the dom0,
> and `gpart resize -i 2 zvol/zdata/VM/win81/root`
> but this didn't change the above failure.
> 
> Only after reboot the guest can be started so somewhere must be a mismatch of 
> cached data...
> 
> Any clues?
> 
> Thanks in advance!
> 
> Greetings
> ---
> Michael Reifenberger (mr @ freebsd...)
> 
> 
> 
> 
> 
> Gruß
> ---
> Michael Reifenberger
> 
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