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Re: [libvirt] [PATCH] storage pool discovery



On Mon, Aug 04, 2008 at 11:19:25AM +0200, Stefan de Konink wrote:
> Daniel P. Berrange schreef:
> >On Mon, Aug 04, 2008 at 11:02:33AM +0200, Stefan de Konink wrote:
> >>On Mon, 4 Aug 2008, Daniel P. Berrange wrote:
> >>
> >>>>- - For iSCSI and related stuff everything was relatively easy, because
> >>>>  this would just mean to write the right /dev/blabla to the xenstore.
> >>>>  What is your idea to get different drivers working via:
> >>>>  virt://pool/volume (so basically blktap vs file vs disk)
> >>>My idea was to have a script in /etc/xen/scripts/
> >>Me too, but in order to 'fetch' the actual configuration it is required to
> >>contact libvirt. And query about the pool/volume location. In this way it
> >>would be actually a 'redirection' to blktap or adding a devicepath.
> >>
> >>So this script is now written in plain C, but I want to know how you
> >>imagine the driver selection based on connection uri.
> >You can simply use  xen:/// as the URI. There is no need for configurable
> >URIs since thisis a xen specific script.
> 
> You don't get the issue. In order to run a specific script for example a 
> block device, it should have an unique prefix. That will make the 
> executable that is called so virt:// will call 
> /etc/xen/scripts/block-virt as script.
> 
> As you might notice here, the common file://, tap:aio:// or psy:// is 
> not present, so if a pool is file based or device based it should some 
> how inform this 'script' how to redirect the parameters to the 
> appropriate script.

This is what the <driver> tag in the XML can be used for. It can include
a driver name (file, phys, tap) and subtype (raw, aio, qcow, etc). You
just need to decide how to encode this info when passing it to Xend.


Daniel
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