Re: [Xen-devel] Wonky results with pvops live migration under 4.0.1

[Pim van Riezen <pi+lists@xxxxxxxxxxxx>]

Forgot to mention, in both ok and failed cases, xend logs a succesful 
snapshot/restore on both sides of the migration.

On Feb 4, 2011, at 12:26 , Pim van Riezen wrote:

> Good day,
> 
> We migrated one of our Xen clusters to the gitco 4.0.1 release after seeing 
> that it seemed to fix the live migration issues we were having under 3.4.3 on 
> our test cluster. It turns out our tests had no bearing on our production 
> cluster.
> 
> The production cluster is a mix of mostly AMD Opteron with a few Intel Xeon. 
> Migration issues do not correlate to cpu architectures, however.
> 
> I have run a test with a machine running pvops 2.6.32.25 performing live 
> migrations. For some source & destination pairs the migration would 
> consistently work. For other combinations it would consistently break.
> 
> The symptoms when it breaks are that the console does not respond to keyboard 
> input. The network does ping. Interactive ssh sessions no longer work. The 
> shell is loaded, but it also does not respond to keyboard input. 
> Noninteractive ssh calls are normally executed. If a shutdown is sent to the 
> vps, the shutdown sequence seems to hang on running sync.
> 
> All dom0 nodes run CentOS 5.5 with gitco Xen 4.0.1 repositories. Here is a 
> raw dump of some migration tests:
> 
> A = 16 cores Xeon, 48GB memory, Emulex FC 8Gb
> B-E = 24 cores Opteron, 128GB memory, Emulex FC 8Gb
> 
> C->B  OK
> B->C  FAIL
> B->C  FAIL
> C->B  OK
> D->C  OK
> C->D  FAIL
> C->D  FAIL
> B->D  FAIL
> D->B  OK
> E->F  OK
> F->E  FAIL
> F->E  FAIL
> E->A  OK
> A->E  FAIL
> 
> The guest has 256MB memory, all dom0s are configured in bridging mode (with 
> the bridges attached to a vlan interface). 
> 
> Is there anything I should try?
> 
> Cheers,
> Pim van Riezen
> 
> 
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel


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