Re: [Xen-users] domU migration from Xen 4.8 HyperVisor to Xen 4.4

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Fri, Aug 17, 2018 at 03:24:03PM +0200, Alessandro Tugnoli wrote:
> Hi all
> 
> I've just upgraded my hypervisor (let be "host1") to Debian 9 "Stretch" with
> Xen 4.8 (before upgrade I had Debian 8 "jessie" with Xen 4.4 Hypervisor) and
> DRBD for High Availability
> 
> Everithing works well and I'm able to run all my domU in the hypervisor just
> updated but, when I try to migrate one domU to another Host (let be "host2",
> that has Debian 8 Jessie and Xen 4.4 Hypervisor and of course DRBD for High
> Availability)
> 
> it gives me an error:
> 
> host1# xl migrate domU host2
> 
> usr/lib/xen-4.4/bin/xl: invalid option -- 't'
> unknown global option
> libxl: error: libxl_utils.c:508:libxl_read_exactly: file/stream truncated
> reading banner from migration receiver stream
> libxl: info: libxl_exec.c:118:libxl_report_child_exitstatus: migration
> transport process [13772] exited with error status 2
> 
> 
> If I try the migration from host2 to host1 I get instad:
> 
> host2# xl migrate domU host1
> 
> migration target: Ready to receive domain.
> Saving to migration stream new xl format (info 0x0/0x0/1003)
> Loading new save file <incoming migration stream> (new xl fmt info
> 0x0/0x0/1003)
>  Savefile contains xl domain config
> Parsing config from <saved>
> Traceback (most recent call last):
>   File "/usr/lib/xen-4.8/bin/convert-legacy-stream", line 15, in <module>
>     from xen.migration import legacy, public, libxc, libxl, xl
> ImportError: No module named xen.migration
> libxl: error: libxl_stream_read.c:342:stream_header_done: Invalid ident:
> expected 0x4c6962786c466d74, got 0x0000000000000000
> libxl: error: libxl_utils.c:396:libxl_read_exactly: file/stream truncated
> reading ipc msg header from domain 19 save/restore helper stdout pipe
> libxl: error: libxl_exec.c:129:libxl_report_child_exitstatus: domain 19
> save/restore helper [-1] died due to fatal signal Broken pipe
> migration sender: libxl_domain_suspend failed (rc=-3)
> libxl: info: libxl_exec.c:118:libxl_report_child_exitstatus: migration
> target process [6462] exited with error status 255
> Migration failed, resuming at sender.
> 
> Is this normal because the hypervisor has different toolstack version?

Migration to older versions is not supported, albeit it might work.
Only migration between equal or newer versions is supported. Migration
from 4.4 to 4.8 should work, but migration from 4.8 to 4.4 is likely
to fail as you have noted above.

Roger.

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