Using an lvm manager that supports snapshotting (copy on write), and
periodically syncing ''base'' volumes between hosts would
probably be the best
way to manage this. Downside is that you now have the overhead of
snapshots, plus maintain a full copy of the disk image on both machines
involved. The benefit is that on migration, you only need to transfer the
cow snapshot which would typically be much smaller, not a good option for, a
fileserver for example, but a webserver that has mostly static content would
be an ideal candidate, where the changes on a daily basis might only be in
the 10''s of megabytes. As to a premade tool to do this, there is none
that
I know of, but afaik there is places to hook in to run such a script. Be
aware, that even with a ''fast'' method like this,
you''ll probably extend the
downtime considerably.
_____
From: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Todd Deshane
Sent: January 19, 2008 12:15 AM
To: Andrew McCormack
Cc: xen-users@lists.xensource.com
Subject: Re: [Xen-users] Xen Live Migration
On Jan 10, 2008 1:42 PM, Andrew McCormack <merlinn@gmail.com> wrote:
I''m a little confused as to what I''ve found regarding Live
Migration. Is it
true that there is a central file system accessible to both hosts and that
all that is transferred is the current MEMORY contents of the domain?
That is the basic idea yes.
If this is true, is there no way to physically transfer the domain file
system from one host to another? Thanks.
In theory this could be done, but would require a lot more overhead. I
can''t
recall if there is any work with Xen on this or not. I believe OpenVZ, which
virtualizes at a layer higher (the operating system), has support for live
migration without the central file system.
Regards,
Todd
-Andrew
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