[Xen-users] Domain sometimes does not migrate completely (an entry with the string "migrating-" remains on the source host)

[Igor Chubin <igor@xxxxxxx>]

Hello, all. 

I have a trouble with live migration of domains.

I have a Xen-DRBD cluster with DRBD-devices working over LVM
volumes.


There are strange situations sometimes.
I start live migration of a domain.
The domain moves from one host to the other
ant continues working there, 
but the line "migrating-" remains on the source host

For example:

migrating-dns                               13   128     2 ---s--      0.0

At the same time on the other host:

dns                                         13   128     2 -b----      0.5

And the domain continues working!



I must note that this happens not every migration, 
but occasionally. In ~20% of cases.

The logs are ok. There are no strange entries at all.

The host systems are completely identical and rsynced.

I use Xen 3.3.1 built from source and PV-kernel version 2.6.18
(installed both in the domain 0 and in the domain U).

The same problem exists when using Xen 3.2.1, 
installed from Debian repositories. 

But I must note, that that system was installed several 
years ago, and all was fine until Xen was upgraded to the version 3.2.
(So, there was no such a problem with Xen 3.1 !)


Did anybody meet something like this?

Any ideas how I should get rid of the entry "migrating-dns"
in the xm list output (and how I should clean corresponding data
structures)?


Thank you very much for any ideas, suggestions or any help!

-- 
Igor Chubin


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