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Re: [Xen-devel] [PATCH] External device migration support

"Michael Paesold" <mpaesold@xxxxxx> wrote on 03/27/2006 08:31:08 AM:

> Stefan Berger wrote:
> > This patch enables external devices, such as for example a mounted hard
> > drive image or a TPM, to be migrated to a remote machine. The patch
> > hooks into the checkpointing (XendCheckpoint.py) code and performs
> > migration in 4 different steps:
> ...
> > Please let me know what you think about this idea.
> I really like the idea because it seems to work for any external device that
> can be migrated but does not allow concurrent access from both migration
> source and destination.

You mean that for example concurrent access to a disk image file is not possible by both systems?

> I have not looked at the patch in detail, but I saw the specific inclusion
> of
> +# The tool used for initiating virtual TPM migration
> +#(vtpm-migration-tool '')
> Could this migration tool specification be more generalized so that any
> device migration can be configured, not just vtpm devices?

I am going to change this and make this one single 'migration-tool'. I will have that tool know by command line parameter (s.th. like '-type vtpm') what device the call for migration is about. If the external tool is a script you can switch over the '-type' parameter and call another external program that handles that particular device type, otherwise that external tool needs to know how to handle migration of all kinds of devices. I will change this and repost.


> Best Regards,
> Michael Paesold
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