[libvirt] Re: [PATCH v2] implement virsh dump for qemu guests
Chris Lalancette
clalance at redhat.com
Fri Jul 10 10:40:15 UTC 2009
Daniel P. Berrange wrote:
> On Fri, Jul 10, 2009 at 11:30:23AM +0200, Paolo Bonzini wrote:
>> On 07/10/2009 11:26 AM, Daniel P. Berrange wrote:
>>> On second review, this does not look correct. The VM continues to run
>>> normally throughout any 'migrate' operation and is never stopped, as
>>> this is the whole point of 'live' migration.
>> The reason for the 'cont' command is that the migrate operation always
>> stops the VM at the end of the migration. So the cont command is always
>> necessary.
>
> Oh, i see what you mean.
>
>>> The semantics of virDomainDumpCore (as defined by the current& only
>>> impl in the Xen driver), as that the core dump operation should be
>>> non-live.
>> Actually that was done on purpose. Should I prepare a v3 doing a stop
>> before the migration, and then work out how to implement the flag?
>
> Yeah, lets just add the explicit 'stop' command before doing the
> migrate. And then make live/non-live a flag in a subsequent patch
Yeah, we should do this. You can also go further; xm allows you to either do
live or non-live core-dump, and also to crash or not crash the domain after the
dump. While non-live, crashing dump is by far the most useful (and hence should
be the default), the other 3 modes do have their place as well.
--
Chris Lalancette
More information about the libvir-list
mailing list