[Xen-users] Re: Xen-users Digest, Vol 22, Issue 145

[Michael Froh <michael.froh@xxxxxxxxxx>]

> From: Nico Kadel-Garcia <nkadel@xxxxxxxxx>
> Date: December 28, 2006 6:32:42 AM EST (CA)
> To: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
> Cc: "Bhatia, Nikhil" <bhatia@xxxxxxxx>, xen- 
> devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx,  
> ian.pratt@xxxxxxxxxxxx
> Subject: Re: [Xen-users] RE: [Xen-devel] Xen-3.0.3 migration problems
>
>
> Ian Pratt wrote:
> > > xm migrate --live vcs-dmz02 dmz03.ornl.gov
> > >
> > > Error: can't connect: No route to host
> > >
> > > Usage: xm migrate <Domain> <Host>
> >
> > Have you edited /etc/xen/xend-config.sxp on both hosts to enable the
> > relocation service?
> >
> > Best,
> > Ian
> Does it need to be on both hosts? And do there need to be image  
> files *already* in place on the target host in /var/lib/xen/ 
> images/? And what if you've been using LVM managed disk partitions  
> for your working Xen images?
> Unfortunately, I'm finding the documentation for Xen troublesomely  
> poor.
Nico.

From the Xen 3.0 PDF documentation
HTML - http://tx.downloads.xensource.com/downloads/docs/user/
PDF - http://bits.xensource.com/Xen/docs/user.pdf


From the HTML and PDF documents, Section 8.2:

"To perform a live migration, both hosts must be running Xen / xend  
and the destination host must have sufficient resources (e.g. memory  
capacity) to accommodate the domain after the move. Furthermore we  
currently require both source and destination machines to be on the  
same L2 subnet.
Currently, there is no support for providing automatic remote access  
to filesystems stored on local disk when a domain is migrated.  
Administrators should choose an appropriate storage solution (i.e.  
SAN, NAS, etc.) to ensure that domain filesystems are also available  
on their destination node. GNBD is a good method for exporting a  
volume from one machine to another. iSCSI can do a similar job, but  
is more complex to set up."

From the PDF document, Appendix A.4.6:

"VMX guests currently cannot be saved and restored, nor migrated.  
These features are
currently under active development."


From http://lists.xensource.com/archives/html/xen-users/2006-12/ 
msg00233.html:
"I believe HVM save/restore/migration is planned for Xen 3.0.5."


Also check the comments in the xend-config.sxp for the settings  
needed for migration.
Cheers,
Michael.

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