Re: [Xen-devel] external device migrate scripts

[Tavi Santi <tavi_santi@xxxxxxxxx>]

----- Original Message ----
From: Ewan Mellor <ewan@xxxxxxxxxxxxx>
To: Tavi Santi <tavi_santi@xxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Sent: Thursday, November 30, 2006 11:14:49 PM
Subject: Re: [Xen-devel] external device migrate scripts

On Thu, Nov 30, 2006 at 12:50:07PM -0800, Tavi Santi wrote:

> Hi,
> 
> I am trying to understand how the restore part of the external device
> migration works. I made some scripts for external device save, similar to
> the vtpm ones in /etc/xen/scripts. These scripts will run during migration
> on the source host.
> 
> However, I need to make them talk with their counterparts on the
> destination host and I can't figure out which is the appropriate place to
> call them from so that I am consistent with the other external devices
> such as vtpm. Is the restore() in /tools/python/xen/xend/XendCheckpoint.py
> the answer?

I think you will have to give us some more information -- what are you
trying to do?

Ewan.

I am trying to migrate blkif devices. I order to manage synchronization, I need 
some 
scripts to run on both sides. I am calling the script on the source using the 
tools/examples/external-device-migrate script, similar to the vtpm (I have 
added a migrate
method to tools/python/xen/xend/server/blkif.py which can be traced back to the 
save() in 
XendCheckpoint.py). The script on the destination should also be called when 
migration
starts but I don't really know where from. This is probably because I am very 
new to xen and 
I am missing where the other external devices (like the vtpm) are doing the 
same thing.

Thank you.





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