Re: [Xen-users] Live migration problem with xen 3.2

[Yann Cezard <yann.cezard@xxxxxxxxxxx>]

Yann Cezard a Ãcrit :
> Hi,
>
> Live migration was working well for me with 3.1.
> Recently I move to 3.2, and now live migration does not work anymore.
> Here is what i obtain on source node :
> ----
> xm migrate --live webdav node2
> Error: /usr/lib/xen-3.2-1/bin/xc_save 26 6 0 0 1 failed
> Usage: xm migrate <Domain> <Host>
> [...]
> ----
>
> [...]
>
> For information, the domU is installed on a SAN LUN.
> The Xen 3.2 install is the Debian Testing one, and kernel in dom0 is
> 2.6.18.8 from
> Xen source (64 bits dom0).
>
> Have I missed something I should change in config from 3.1 to 3.2 in
> order to have
> live migration working ? Does anyone has the same problem ?
>
> Any clue is welcome !
>
> Cheers,
>
>   
After having investigate a little this week, it seems that I can migrate
64bits domU, but not 32 bits ones.

In fact, the problem is that "xm save" fails on saving 32 bits domU,
and works fine on 64 bits domU.

-----------
[2008-03-07 11:06:28 15975] DEBUG (XendCheckpoint:89) [xc_save]:
/usr/lib/xen-3.2-1/bin/xc_save 5 7 0 0 0
[2008-03-07 11:06:28 15975] DEBUG (XendCheckpoint:336) suspend
[2008-03-07 11:06:28 15975] DEBUG (XendCheckpoint:92) In
saveInputHandler suspend
[2008-03-07 11:06:28 15975] DEBUG (XendCheckpoint:94) Suspending 7 ...
[2008-03-07 11:06:28 15975] DEBUG (XendDomainInfo:467)
XendDomainInfo.shutdown(suspend)
[2008-03-07 11:06:28 15975] DEBUG (XendDomainInfo:1085)
XendDomainInfo.handleShutdownWatch
[2008-03-07 11:06:28 15975] DEBUG (XendDomainInfo:1085)
XendDomainInfo.handleShutdownWatch
[2008-03-07 11:06:28 15975] INFO (XendDomainInfo:1273) Domain has
shutdown: name=migrating-scratchy id=7 reason=suspend.
[2008-03-07 11:06:28 15975] INFO (XendCheckpoint:99) Domain 7 suspended.
[2008-03-07 11:06:28 15975] DEBUG (XendCheckpoint:107) Written done
[2008-03-07 11:06:28 15975] ERROR (XendCheckpoint:141) Save failed on
domain scratchy (7).
Traceback (most recent call last):
  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendCheckpoint.py", line
109, in save
    forkHelper(cmd, fd, saveInputHandler, False)
  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendCheckpoint.py", line
353, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib/xen-3.2-1/bin/xc_save 5 7 0 0 0 failed
[2008-03-07 11:06:28 15975] DEBUG (XendDomainInfo:1922)
XendDomainInfo.resumeDomain(7)
[2008-03-07 11:06:28 15975] DEBUG (XendDomainInfo:1952)
XendDomainInfo.resumeDomain: completed
[2008-03-07 11:06:28 15975] DEBUG (XendCheckpoint:144)
XendCheckpoint.save: resumeDomain
-----------

Isn't it possible to save/migrate 32 bits domU with 64 bits dom0 ?

Thanks

-- 
Yann CÃzard - Administrateur SystÃmes Serveurs
Centre de Ressources Informatiques de l'UPPA (http://cri.univ-pau.fr)
Bat IFR, rue Jules Ferry, 64000 PAU       TÃl.:  +33 (0)5 59 40 77 94


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