Re: [Xen-users] Live migration not permanent?

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

Jeff Lane wrote:
> On Fri, May 16, 2008 at 6:38 PM, [STD]Ein <ein@xxxxxxxxxxxxxx> wrote:
>   
> > It is the expected behaviour.  It's your responsibility to ensure that the
> > domain isn't started on more than one host at a time (this may be enforced
> > by your shared storage solution).
> >     
> Yep.  The only thing live migration does is move the running domU from
> its current memory location on Host A, to a new memory location in
> Host B.  It does not move any config files, and you MUST use shared
> storage to have a working domU on Host B after migration.  You CAN
> migrate a domain that has storage local to Host A but not Host B,
> however, what happens is that on Host B, you get a running guest that
> can not access its filesystem, and much hilarity ensues when you try
> to do anything that involves accessing the filesystem.
>
> So, the requirements are:
>
> Host A --|
>               ----- Shared Storage (I use Fiberchannel storage for this)
> Host B --|
>
> And, if you want to permenantly move the domU from host A to host B,
> you need to move the domU config file from hostA to hostB as well.
>
> Also, you could have Host A be a mirror of Host B (failover scenario)
> so if Host A bites the dust, you can run the domU to your heart's
> content on Host B, since B has the config file too...
>
> YMMV, of course...
>
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>
>   
So, how does one move a domU from one physical server to another 
physical server if there's no shared storage in between?
--

Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other 
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