xen live migration falied

xen live migration falied

[elahe shekuhi]

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Hi everybody,

I have setup Xen 4.1.2 on OpenSuse 12.1. It is running fine so far, but live
migration does not work. While the source host works on the "xm migrate -l
..." command, I can see the VM on the target host in paused state in "xm
list", but after a while it vanishes while the xm command on the source
machine returns whitout any errors.

(One machine has core i7 processor while another is core 2 quad system).


 I have searched the net and this list and found a few posts mentioning this
error, but no solution, not even a hint
   on the source of the problem.

Any help would be really appreciated. Thanks.

best wishes

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Re: xen live migration falied

[Jan Beulich]

>>> On 06.06.12 at 09:00, elahe shekuhi <e.shekuhi@gmail.com> wrote:
> I have setup Xen 4.1.2 on OpenSuse 12.1. It is running fine so far, but live
> migration does not work. While the source host works on the "xm migrate -l
> ..." command, I can see the VM on the target host in paused state in "xm
> list", but after a while it vanishes while the xm command on the source
> machine returns whitout any errors.

Does the guest crash perhaps? In which case a kernel log from it
might turn out pretty useful. As would technical data (rather than
a simple "does not work") in the first place (hypervisor, xend, and
Dom0 kernel logs are all possible candidates for holding relevant
information).

> (One machine has core i7 processor while another is core 2
> quad system).

Does migration fail in both directions? Or perhaps just from the
newer to the older system (in which case I would guess you're
not masking features properly on the newer one)?

Jan

Re: xen live migration falied

[Ian Campbell]

On Wed, 2012-06-06 at 08:41 +0100, Jan Beulich wrote:
> >>> On 06.06.12 at 09:00, elahe shekuhi <e.shekuhi@gmail.com> wrote:
> > I have setup Xen 4.1.2 on OpenSuse 12.1. It is running fine so far, but live
> > migration does not work. While the source host works on the "xm migrate -l
> > ..." command, I can see the VM on the target host in paused state in "xm
> > list", but after a while it vanishes while the xm command on the source
> > machine returns whitout any errors.
> 
> Does the guest crash perhaps? In which case a kernel log from it
> might turn out pretty useful. As would technical data (rather than
> a simple "does not work") in the first place (hypervisor, xend, and
> Dom0 kernel logs are all possible candidates for holding relevant
> information).

Elahe, please see http://wiki.xen.org/wiki/Reporting_Bugs_against_Xen
for advice about the kind of information which you can usefully include
in a bug report.

Thanks,
Ian.

> 
> > (One machine has core i7 processor while another is core 2
> > quad system).
> 
> Does migration fail in both directions? Or perhaps just from the
> newer to the older system (in which case I would guess you're
> not masking features properly on the newer one)?
> 
> Jan
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: xen live migration falied

[elahe shekuhi]

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Hi,

 Thanks for your attention.

On Wed, Jun 6, 2012 at 8:41 AM, Jan Beulich <JBeulich@suse.com> wrote:

> >>> On 06.06.12 at 09:00, elahe shekuhi <e.shekuhi@gmail.com> wrote:
> > I have setup Xen 4.1.2 on OpenSuse 12.1. It is running fine so far, but
> live
> > migration does not work. While the source host works on the "xm migrate
> -l
> > ..." command, I can see the VM on the target host in paused state in "xm
> > list", but after a while it vanishes while the xm command on the source
> > machine returns whitout any errors.
>
> Does the guest crash perhaps? In which case a kernel log from it
> might turn out pretty useful. As would technical data (rather than
> a simple "does not work") in the first place (hypervisor, xend, and
> Dom0 kernel logs are all possible candidates for holding relevant
> information).
>
> > (One machine has core i7 processor while another is core 2
> > quad system).
>
> Does migration fail in both directions? Or perhaps just from the
> newer to the older system (in which case I would guess you're
> not masking features properly on the newer one)?
>

   Yes, Migration failed in both directions, but the error in Xend.log is
different. When I do migrate VM from core 2 quad to core i7 machine the
error in Xend.log is

[2012-04-23 17:25:55 1405] DEBUG (XendDomainInfo:237)
XendDomainInfo.restore(['domain', ['domid', '5'], ['cpu_weight', '256'],
['cpu_cap', '0'], ['pool_name', 'Pool-0'], ['bootloader',
'/usr/bin/pygrub'], ['vcpus', '2'], ['cpus', [[], []]], ['on_poweroff',
'destroy'], ['description', 'None'], ['on_crash', 'destroy'], ['uuid',
'9d19e419-83ca-e877-52e4-0f93f634354a'], ['bootloader_args', '-q'],
['name', 'sles11-1'], ['on_reboot', 'restart'], ['maxmem', '1024'],
['memory', '512'], ['shadow_memory', '0'], ['vcpu_avail', '3'],
['features', ''], ['on_xend_start', 'ignore'], ['on_xend_stop', 'ignore'],
['start_time', '1335185584.3'], ['cpu_time', '0.353877786'],
['online_vcpus', '2'], ['image', ['linux', ['kernel', ''], ['args', ' '],
['superpages', '0'], ['videoram', '4'], ['pci', []], ['nomigrate', '0'],
['tsc_mode', '0'], ['device_model', '/usr/lib/xen/bin/qemu-dm'], ['notes',
['FEATURES',
'writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel'],
['VIRT_BASE', '18446744071562067968'], ['GUEST_VERSION', '2.6'],
['PADDR_OFFSET', '0'], ['GUEST_OS', 'linux'], ['HYPERCALL_PAGE',
'18446744071564193792'], ['LOADER', 'generic'], ['SUSPEND_CANCEL', '1'],
['ENTRY', '18446744071564165120'], ['XEN_VERSION', 'xen-3.0']]]],
['status', '2'], ['state', '-b----'], ['store_mfn', '470107'],
['console_mfn', '470106'], ['device', ['vif', ['bridge', 'br0'], ['mac',
'00:16:3e:44:ac:23'], ['script', '/etc/xen/scripts/vif-bridge'], ['uuid',
'f3a500be-df8d-a7fe-881e-b8d8347dce74'], ['backend', '0']]], ['device',
['vkbd', ['backend', '0']]], ['device', ['console', ['protocol', 'vt100'],
['location', '2'], ['uuid', '0debd581-e78c-c87c-8012-330fa7d0eafb']]],
['device', ['vbd', ['protocol', 'x86_64-abi'], ['uuid',
'8e7150c8-4af1-88c0-e71b-16049663cebc'], ['bootable', '1'], ['dev',
'xvda:disk'], ['uname', 'file:/home/elahe/xen/images/sles11-1/disk0.raw'],
['mode', 'w'], ['backend', '0'], ['VDI', '']]], ['device', ['vbd',
['protocol', 'x86_64-abi'], ['uuid',
'55ff031d-7810-1b41-ed7b-f7fce59c6dcd'], ['bootable', '0'], ['dev',
'xvdb:cdrom'], ['uname', 'phy:/dev/sr0'], ['mode', 'r'], ['backend', '0'],
['VDI', '']]], ['device', ['vfb', ['vncunused', '1'], ['vnc', '1'],
['xauthority', '/root/.Xauthority'], ['keymap', 'en-us'], ['location',
'127.0.0.1:5900'], ['uuid', '3d8f53d2-97b8-770b-59c7-69ac1cd302fa']]],
['change_home_server', 'False']])

[2012-04-23 17:25:55 1405] DEBUG (XendDomainInfo:2562)
XendDomainInfo.constructDomain

[2012-04-23 17:25:55 1405] DEBUG (balloon:206) Balloon: 538624 KiB free;
need 16384; done.

[2012-04-23 17:25:55 1405] DEBUG (XendDomain:482) Adding Domain: 4

[2012-04-23 17:25:55 1405] DEBUG (XendDomainInfo:3514) Storing VM details:
{'on_xend_stop': 'ignore', 'pool_name': 'Pool-0', 'shadow_memory': '0',
'uuid': '9d19e419-83ca-e877-52e4-0f93f634354a', 'on_reboot': 'restart',
'start_time': '1335185584.3', 'on_poweroff': 'destroy', 'bootloader_args':
'-q', 'on_xend_start': 'ignore', 'on_crash': 'destroy',
'xend/restart_count': '0', 'vcpus': '2', 'vcpu_avail': '3', 'bootloader':
'/usr/bin/pygrub', 'image': "(linux (kernel '') (args ' ') (superpages 0)
(videoram 4) (pci ()) (nomigrate 0) (tsc_mode 0) (device_model
/usr/lib/xen/bin/qemu-dm) (notes (FEATURES
'writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel')
(VIRT_BASE 18446744071562067968) (GUEST_VERSION 2.6) (PADDR_OFFSET 0)
(GUEST_OS linux) (HYPERCALL_PAGE 18446744071564193792) (LOADER generic)
(SUSPEND_CANCEL 1) (ENTRY 18446744071564165120) (XEN_VERSION xen-3.0)))",
'name': 'sles11-1'}

[2012-04-23 17:25:55 1405] DEBUG (image:343) No VNC passwd configured for
vfb access

[2012-04-23 17:25:55 1405] DEBUG (XendCheckpoint:359) restore:shadow=0x0,
_static_max=0x40000000, _static_min=0x0,

[2012-04-23 17:25:55 1405] DEBUG (XendCheckpoint:386) [xc_restore]:
/usr/lib64/xen/bin/xc_restore 4 4 1 2 0 0 0 0

[2012-04-23 17:26:41 1405] INFO (XendCheckpoint:487) xc: error: Couldn't
set eXtended States for vcpu0 (22 = Invalid argument): Internal error

[2012-04-23 17:26:41 1405] DEBUG (XendDomainInfo:3150)
XendDomainInfo.destroy: domid=4

[2012-04-23 17:26:41 1405] ERROR (XendDomainInfo:3164)
XendDomainInfo.destroy: domain destruction failed.
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomainInfo.py",
line 3157, in destroy
    xc.domain_pause(self.domid)
Error: (3, 'No such process')

[2012-04-23 17:26:41 1405] DEBUG (XendDomainInfo:2470) No device model

[2012-04-23 17:26:41 1405] DEBUG (XendDomainInfo:2472) Releasing devices

[2012-04-23 17:26:41 1405] ERROR (XendCheckpoint:421)
/usr/lib64/xen/bin/xc_restore 4 4 1 2 0 0 0 0 failed
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py",
line 390, in restore
    forkHelper(cmd, fd, handler.handler, True)
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py",
line 475, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_restore 4 4 1 2 0 0 0 0 failed

[2012-04-23 17:26:41 1405] ERROR (XendDomain:1200) Restore failed
Traceback (most recent call last):

 File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomain.py", line
1184,
 in domain_restore_fd
    dominfo = XendCheckpoint.restore(self, fd, paused=paused,
relocating=relocating)

File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py", line
422,
in restore
    raise exn
XendError: /usr/lib64/xen/bin/xc_restore 4 4 1 2 0 0 0 0 failed


I would be really appreciated.

Best,
elahe

>
> Jan
>
>
>

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Re: xen live migration falied

[Mark Dokter]

On 06/06/2012 08:15 PM, elahe shekuhi wrote:
> Hi,
> 

Hi!

Maybe you could try using xl instead of xm. They behave differently
concerning sources of errors imho.

hth, Mark

Re: xen live migration falied

[elahe shekuhi]

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Hi,

How to use "xl"? Should xend be disable? How do I configure host and
destination machines for live migration? Is it as before like for xm
utility?

On Thu, Jun 7, 2012 at 7:42 AM, Mark Dokter <dokter@icg.tugraz.at> wrote:

> On 06/06/2012 08:15 PM, elahe shekuhi wrote:
> > Hi,
> >
>
> Hi!
>
> Maybe you could try using xl instead of xm. They behave differently
> concerning sources of errors imho.
>
> hth, Mark
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
>

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Re: xen live migration falied

[elahe shekuhi]

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Hi,

 I try with xl tool, but the error is the same.

On Thu, Jun 7, 2012 at 8:57 AM, elahe shekuhi <e.shekuhi@gmail.com> wrote:

> Hi,
>
> How to use "xl"? Should xend be disable? How do I configure host and
> destination machines for live migration? Is it as before like for xm
> utility?
>
>
> On Thu, Jun 7, 2012 at 7:42 AM, Mark Dokter <dokter@icg.tugraz.at> wrote:
>
>> On 06/06/2012 08:15 PM, elahe shekuhi wrote:
>> > Hi,
>> >
>>
>> Hi!
>>
>> Maybe you could try using xl instead of xm. They behave differently
>> concerning sources of errors imho.
>>
>> hth, Mark
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xen.org
>> http://lists.xen.org/xen-devel
>>
>
>

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Re: xen live migration falied

[Jan Beulich]

>>> elahe shekuhi <e.shekuhi@gmail.com> 06/06/12 8:15 PM >>>
>On Wed, Jun 6, 2012 at 8:41 AM, Jan Beulich <JBeulich@suse.com> wrote:
>> Does migration fail in both directions? Or perhaps just from the
>> newer to the older system (in which case I would guess you're
>> not masking features properly on the newer one)?
>>
>
>Yes, Migration failed in both directions, but the error in Xend.log is
>different. When I do migrate VM from core 2 quad to core i7 machine the
>error in Xend.log is

Are you certain (i.e. is this really with the VM freshly started on the Core2
system)? I ask because this ...

>[2012-04-23 17:26:41 1405] INFO (XendCheckpoint:487) xc: error: Couldn't
>set eXtended States for vcpu0 (22 = Invalid argument): Internal error

... indicates that XSAVE state was available for the guest, but couldn't
be restored, yet iirc Core2 doesn't know XSAVE yet.

Irrespective of that you could try booting the hypervisors on both sides
with "no-xsave" and see whether that makes things any better (i.e.
work at least in one direction). But generally, if you opened an entry in
our bugzilla for this, we'd tell you that migration is only supported
between feature-identical machines, or at best with features masked
to the common subset on both systems.

Jan

Re: xen live migration falied

[elahe shekuhi]

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On Thu, Jun 7, 2012 at 7:59 PM, Jan Beulich <jbeulich@suse.com> wrote:

> >>> elahe shekuhi <e.shekuhi@gmail.com> 06/06/12 8:15 PM >>>
> >On Wed, Jun 6, 2012 at 8:41 AM, Jan Beulich <JBeulich@suse.com> wrote:
> >> Does migration fail in both directions? Or perhaps just from the
> >> newer to the older system (in which case I would guess you're
> >> not masking features properly on the newer one)?
> >>
> >
> >Yes, Migration failed in both directions, but the error in Xend.log is
> >different. When I do migrate VM from core 2 quad to core i7 machine the
> >error in Xend.log is
>
> Are you certain (i.e. is this really with the VM freshly started on the
> Core2
> system)? I ask because this ...
>

   Yes I'm certain that the VM freshly started on the Core2 system. When I
migrate the VM from Core2 to Core i7 I always see this error(i.e. "Couldn't
set eXtended States for vcpu0 (22 = Invalid argument): Internal error" ) in
the Xend.log on Core i7 machine.

>
> >[2012-04-23 17:26:41 1405] INFO (XendCheckpoint:487) xc: error: Couldn't
> >set eXtended States for vcpu0 (22 = Invalid argument): Internal error
>
> ... indicates that XSAVE state was available for the guest, but couldn't
> be restored, yet iirc Core2 doesn't know XSAVE yet.
>
> Irrespective of that you could try booting the hypervisors on both sides
> with "no-xsave" and see whether that makes things any better (i.e.
> work at least in one direction). But generally, if you opened an entry in
> our bugzilla for this, we'd tell you that migration is only supported
> between feature-identical machines, or at best with features masked
> to the common subset on both systems.
>


   Also, when I migrate a VM freshly started on the Core i7 system to core
2, I get another error in xend.log on core2 system(i.e. destination
system). The error is

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:3150)
XendDomainInfo.destroy: domid=2

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:2465) Destroying device
model

[2012-06-07 12:03:31 30425] INFO (image:711) s1 device model terminated

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:2472) Releasing devices

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:2478) Removing vif/0

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = vif, device = vif/0

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:2478) Removing vkbd/0

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = vkbd, device = vkbd/0

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:2478) Removing console/0

[2012-06-07 12:03:31 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = console, device = console/0

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:2478) Removing vbd/51728

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = vbd, device = vbd/51728

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:2478) Removing vfb/0

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = vfb, device = vfb/0

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:2470) No device model

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:2472) Releasing devices

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:2478) Removing vif/0

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = vif, device = vif/0

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:2478) Removing vbd/51728

[2012-06-07 12:03:32 30425] DEBUG (XendDomainInfo:1278)
XendDomainInfo.destroyDevice: deviceClass = vbd, device = vbd/51728

[2012-06-07 12:03:32 30425] ERROR (XendCheckpoint:421) Device 51712 (vbd)
could not be connected. losetup /dev/loop0
/home/elahe/xen/images/sles11/disk0.raw failed
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py",
line 412, in restore
    wait_devs(dominfo)
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py",
line 277, in wait_devs
    dominfo.waitForDevices() # Wait for backends to set up
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomainInfo.py",
line 1239, in waitForDevices
    self.getDeviceController(devclass).waitForDevices()
  File
"/usr/lib64/python2.7/site-packages/xen/xend/server/DevController.py", line
140, in waitForDevices
    return map(self.waitForDevice, self.deviceIDs())
  File
"/usr/lib64/python2.7/site-packages/xen/xend/server/DevController.py", line
168, in waitForDevice
    "%s" % (devid, self.deviceClass, err))
VmError: Device 51712 (vbd) could not be connected. losetup /dev/loop0
/home/elahe/xen/images/sles11/disk0.raw failed

[2012-06-07 12:03:32 30425] ERROR (XendDomain:1200) Restore failed
Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendDomain.py", line
1184, in domain_restore_fd
    dominfo = XendCheckpoint.restore(self, fd, paused=paused,
relocating=relocating)
  File "/usr/lib64/python2.7/site-packages/xen/xend/XendCheckpoint.py",
line 422, in restore
    raise exn
VmError: Device 51712 (vbd) could not be connected. losetup /dev/loop0
/home/elahe/xen/images/sles11/disk0.raw failed

Elahe,

>
> Jan
>
>

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Re: xen live migration falied

[Olaf Hering]

On Sat, Jun 09, elahe shekuhi wrote:

> VmError: Device 51712 (vbd) could not be connected. losetup /dev/loop0 /home/
> elahe/xen/images/sles11/disk0.raw failed

Is the directory /home/elahe reachable from both hosts?

Olaf

Re: xen live migration falied

[elahe shekuhi]

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On Sat, Jun 9, 2012 at 9:47 AM, Olaf Hering <olaf@aepfle.de> wrote:

> On Sat, Jun 09, elahe shekuhi wrote:
>
> > VmError: Device 51712 (vbd) could not be connected. losetup /dev/loop0
> /home/
> > elahe/xen/images/sles11/disk0.raw failed
>
> Is the directory /home/elahe reachable from both hosts?
>

   Yes, it is using nfs4.

>
> Olaf
>

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Re: xen live migration falied

[Olaf Hering]

On Wed, Jun 06, elahe shekuhi wrote:

> (One machine has core i7 processor while another is core 2 quad system).
> 
> 
>  I have searched the net and this list and found a few posts mentioning this
> error, but no solution, not even a hint
>    on the source of the problem.

As mentioned by others, for migration (or save/restore) either both
systems have to have identical cpus or the guests view of the cpu has to
be adjusted with the cpuid= config option in the vm config file. In
other words, the "least common denominator" of cpu features has to be
configured.

See my recent post which tries to explain the cpuid= config option:

http://lists.xen.org/archives/html/xen-devel/2012-06/msg00303.html

There is an example in there for xend, and also a link to wikipedia
which has a good list of cpu features. I suggest to boot both systems
with a native kernel and compare the cpu features. Perhaps with
something like this:

grep -wm1 ^flags /proc/cpuinfo | xargs -n1 | sort > /share_dir/core2.txt
grep -wm1 ^flags /proc/cpuinfo | xargs -n1 | sort > /share_dir/i7.txt
diff -u /share_dir/core2.txt /share_dir/i7.txt

I think most of the lines starting with '+' are features which exist
only in i7, which can be hidden with the cpuid= option.


Make sure to install the xen packages from the 12.1 update repository
since they contain two fixes for your environment: an xsave related bug
was fixed, and also guests with a cpuid= option were not restored at all
during system startup.


Olaf

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