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Re: Migration - Xen 4.3

On Sun, 18 Jan 2015, Brian Marcotte wrote:
Has anyone tried Migration recently?

I'm getting this on Xen 4.3, Linux dom0:

 # xl migrate mydomU otherdom0host
 libxl: error: libxl_dom.c:1063:libxl__domain_suspend_common_callback: \
 guest didn't acknowledge suspend, cancelling request

On the domU (netbsd) console, I see this:

 xenbus_shutdown_handler: xenbus_rm 13
 Flushing disk caches: 21 done

The domain is completely locked up and doesn't even respond to "+++++".

It is similar with "xm migrate".

I have never got migration to succeed, nor suspend/resume (which is fundamentally the same operation). Sometimes suspend appears to work, but resume fails.

The usual symptoms for me are that the domain just continues regardless (i.e. it ignores the suspend request) rather than it locks. However, from a dom0 point of view, it waits for confirmation of suspension and so blocks any further operations on it.

I understand that the problem is reasonably well understood by the relevant developers, but that debugging is hard.


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