[Gllug] Xen Control Stuff

[Ian Norton-Badrul]

On Tue, Jul 17, 2007 at 05:16:36PM +0100, Daniel P. Berrange wrote:
> On Tue, Jul 17, 2007 at 10:31:32PM +0100, Ian Norton-Badrul wrote:
> > On Mon, Jul 16, 2007 at 04:30:13PM +0100, Richard Jones wrote:
> > > 
> > > Dan's already given you the libvirt spiel.  I took a look at Dupe, and
> > > since it's written in Perl you'll be interested in the Perl bindings
> > > for libvirt:
> > > 
> > > http://search.cpan.org/~danberr/Sys-Virt-0.1.1/lib/Sys/Virt.pm
> > > 
> > > You'll appreciate libvirt if at some point you decide that Xen isn't
> > > quite the way of the future, and something integrated into the Linux
> > > kernel like KVM or lguest is better.  Not that that would ever happen.
> > > Oh no.
> > 
> > I agree, libvirt is a fairly good bet, however I did find that the perl binding
> > were a tad slow, and plus I have found that alot of the xen xml-rpc calls
> > changed between xen 3.0 and 3.1, so presumably i'd be waiting for libvirt to
> > catch-up before dupe could.
> 
> We supported Xen 3.1 from pretty much the day it came out. We avoid
> the XML-RPC api currently since its was constantly changing. We use
> either direct hypercalls (x1000 faster than talking to XenD) whereever
> possible, only falling back to talking to XenD HTTP service if we have
> no other choice. XenD+XenStoreD are hugely non-scalable for performance
> unfortunately :-(
> 
> > I'll probably re-visit libvirt for perl soon (just as soon as I sort out the
> > problem where I can only boot my xen machine with once pci card).
> 
> Let me know if there's specific issues with the Perl bindings - they
> should be a straight passthrough to the C api, so any speed issues
> are in the underlying code. Most likely I reckon you tried to use
> them as non-root, which would mean it had to talk to XenD instead of
> the hypervisor. In the libvirt from a couple of weeks ago we have
> full 'remote management' letting libvirt securely work as non-root
> both on & off the box - this is again several orders of magnitude
> faster than talking to XenD, so may be of use. 

That sounds extreemly cool! Can I ask, does libvirt provide any interface for
managment of device backends? (disks, lvm etc) 

Ian

-- 
Ian Norton-Badrul

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