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

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?

I'm just testing these command only to be sure that I will be able to migrate domU after upgrading my host to Xen 4.8

Thanks in advance

Best regards


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