[xenpreview-dev] Save / restore / migrate with XTP 13138-29 X86-64 and 32 bit DomUs

[Jan Beulich]

This is a known limitation - save/restore/migrate only work if all three participants
(Xen, dom0, and being migrated domU) are the same architecture. Jan

>>> <tobias.mucke at man.eu> 22.05.07 10:07 >>>

Hi everybody,

today I updated to the newest XTP release 13138-29. We have a mixed
environment. We are using X86-64 Hypervisor, Dom0 is also X86-64 but
Domains are also 32 bit, i.e. X86.

I wanted to check migration functionality with some of our domains.

But this always fails. Here are the logs for migrating a 32 bit DomU, which
is also uptodate concerning the kernel. Of course this is paravirtualized.

sysadm at minxxen011:~> sudo xm migrate mnnxhod001 minxxen010
Error: /usr/lib64/xen/bin/xc_save 20 8 0 0 0 failed
Usage: xm migrate <Domain> <Host>

Migrate a domain to another machine.

Options:

-h, --help           Print this help.
-l, --live           Use live migration.
-p=portnum, --port=portnum
                     Use specified port for migration.
-r=MBIT, --resource=MBIT
                     Set level of resource usage for migration.

sysadm at minxxen011:~>

sysadm at minxxen011:~> sudo cat /var/log/xend.log
[2007-05-22 09:56:44 xend 5290] DEBUG (XendCheckpoint:80) [xc_save]:
/usr/lib64/xen/bin/xc_save 20 8 0 0 0
[2007-05-22 09:56:44 xend.XendDomainInfo 5290] DEBUG (XendDomainInfo:781)
Storing domain details: {'console/ring-ref': '4636350', 'console/port':
'2', 'name': 'migrating-mnnxhod001', 'console/limit': '2097152', 'vm':
'/vm/a0514688-fcb4-9017-4796-813c886297ad', 'domid': '8',
'cpu/0/availability': 'online', 'memory/target': '262144',
'store/ring-ref': '4636351', 'store/port': '1'}
[2007-05-22 09:56:44 xend 5290] INFO (XendCheckpoint:247) ERROR Internal
error: Domain is not in a valid Linux guest OS state
[2007-05-22 09:56:44 xend 5290] INFO (XendCheckpoint:247) Save exit rc=1
[2007-05-22 09:56:44 xend 5290] ERROR (XendCheckpoint:111) Save failed on
domain mnnxhod001 (8).
Traceback (most recent call last):
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 97, in save
    forkHelper(cmd, fd, saveInputHandler, False)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 235, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_save 20 8 0 0 0 failed
[2007-05-22 09:56:44 xend.XendDomainInfo 5290] DEBUG (XendDomainInfo:781)
Storing domain details: {'console/ring-ref': '4636350', 'console/port':
'2', 'name': 'mnnxhod001', 'console/limit': '2097152', 'vm':
'/vm/a0514688-fcb4-9017-4796-813c886297ad', 'domid': '8',
'cpu/0/availability': 'online', 'memory/target': '262144',
'store/ring-ref': '4636351', 'store/port': '1'}
sysadm at minxxen011:~>

Migrating a X86-64 DomU works fine although I see that much more packages
get lost (during a live migration) than in earlier releases. But anyway
migration works.

Does anybody else experienced this issue?

Tobias


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