On Fri, Jul 11, 2014 at 2:19 PM, Markus Armbruster <arm...@redhat.com> wrote: > Eduardo Otubo <eduardo.ot...@profitbricks.com> writes: > >> On Fri, Jul 11, 2014 at 1:12 PM, Markus Armbruster <arm...@redhat.com> wrote: >>> [Top-quote moved to its rightful place; please do not top quote on >>> technical lists] >>> >>> Anshul Makkar <anshul.mak...@profitbricks.com> writes: >>> >>>> On Wed, Jul 9, 2014 at 6:25 PM, Andreas Färber <afaer...@suse.de> wrote: >>>>> Am 09.07.2014 13:09, schrieb Anshul Makkar: >>>>>> Thanks. I got the point. >>>>> >>>>> And for the record, the point is that the machine version on the >>>>> destination side needs to match the source side. So, if the default or >>>>> "pc" alias is used in 1.0, which resolves to pc-1.0, then it needs to be >>>>> pc-1.0, not pc-1.2. If an explicit machine name such as pc-0.15 was used >>>>> then that exact machine must be used on the destination as well. >>> >>>> Hi Andreas, >>>> >>>> "the point is that the machine version on the destination side needs >>>> to match the source side". I hope this is just to avoid the licensing >>>> issue. Else, in all other circumstance, we can specify different pc >>>> models while migrating from source to destination. >>> >>> You certainly can specify whatever machine type you want, but if you >>> specify different machine types on source and target of a migration, all >>> bets are off. >>> >>> It could succeed if the stars align the right way. It could break >>> obviously and immediately, leaving your machine running on the source. >>> It could migrate your machine to the destination successfully, then blow >>> up there right away, or some time later, taking down your machine. It >>> could migrate successfully, but silently corrupt data. >>> >>> Regardless of how it breaks, you get to keep the pieces. >> >> What you're saying is that there's no way to migrate (live or offline) >> from Qemu 1.0/1.2 to 2.0 in a *safe way* whatever OS I'm running on >> it? > > No, what I'm saying is you need to use the same machine type on source > on destination. > > If you don't specify one, you get the default. If you run different > versions of QEMU on source and destination, their default machine type > may differ. > > In that case, find the default machine type on the source (-M help shows > it), then start QEMU on the destination with that machine type. >
Let me rephrase that: What you're saying is that there's no way to migrate (live or offline) from pc-model 1.0/1.2 to pc-model 2.0 in a *safe way* whatever OS I'm running on it? As Anshul said, we want to migrate clients of our data center from Qemu 1.0/1.2 to Qemu 2.0 to take advantage of live vertical scaling -- which implies in changing pc-model to 2.0. At least offline migration you think it could be OK? Regards, -- Eduardo Otubo ProfitBricks
