Re: Stability of migration?

[John Byrne <john.l.byrne@hp.com>]

I should have made clear I am testing on x86_64.

John

John Byrne wrote:
> 
> Hi,
> 
> With xen-unstable changset 10333:360f9dc71f51, live migration is not 
> reliable. Migrating an active domain (I use a kernel build in my test) 
> back and forth between two machines will result in the build or the 
> domain crashing. I tweaked xc_linux_save.c to enable the verify pass 
> without outputting all the debugging messages and I can see that one or 
> two pages do not get a data match in the log.
> 
> I have yet to see a failure of the domain with non-live migration, but I 
> sometimes see a data mismatch on a page during the verification. Which 
> would indicate that either suspend doesn't mean what I think it does or 
> pages of a suspended VM are being altered when they shouldn't be.
> 
> So, I guess I'll start with the easy question: should non-live migration 
> ever have a page fail to verify? If not, how can I identify the source 
> of the problem?
> 
> The harder question: how to identify the source of the corruption in 
> live migration?
> 
> Thanks,
> 
> John Byrne
>