Re: [Xen-users] linux stubdom

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-02-11 at 14:59 +0000, Markus Hochholdinger wrote:
> Hello,
> 
> Am 06.02.2013 um 15:39 Uhr schrieb Markus Hochholdinger 
> <Markus@xxxxxxxxxxxxxxxxx>:
> > Am 01.02.2013 um 09:56 Uhr schrieb Ian Campbell <Ian.Campbell@xxxxxxxxxx>:
> [..]
> > > > executed? Would this be between #3 and #7?
> > > It is part of the device teardown and setup, so it is during #5 and #6
> > > (strictly I think it is just after #5 and just before #6).
> > > On xen-devel at the minute there is a patch series under discussion to
> > > make the script hooks more flexible, in particular adding pre and post
> > > migrate hooks (called something like #1-#3 and #7-#7) which can pre
> > > setup bits of the storage stack which are safe to do with the guest
> > > running but might be slow to initialise (e.g. iSCSI login, but not
> > > opening the device). I don't think this needs to affect you though.
> > at least with xm toolstack, block-scripts in /etc/xen/scripts/block-* are
> > executed on the destination host (add) before the script (remove) on the
> > source host is executed while live migrating a domU.
> > (I've created the script /etc/xen/scripts/block-md which assembles and
> > stops raid1 devices.)
> > Next, I'll test xl toolstack with this setup.
> 
> with Xen 4.1 there's no support for custom scripts within libxl.
> 
> With Xen 4.2.1 there's support for custom scripts (like with xm toolstack) 
> but 
> also only add/remove. And add is called on the destination side before remove 
> is called on the transmitting side while doing a live migration of a domU.

This sounds like a bug which ought to be addressed (Roger, can you take
a look?)

> Next I'll test latest development version...

I'm not sure it will differ from 4.2.x in this area (yet). Roger can
probably advise better than me though.

Ian.


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