Re: [Xen-devel] Xen 4.4 development update: Is PVH a blocker?

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Dec 16, 2013 at 10:54:17AM +0000, Ian Campbell wrote:
> On Fri, 2013-12-13 at 14:43 -0500, Konrad Rzeszutek Wilk wrote:
> > > == Open ==
> > >
> > Also, xl as opposed to xend, allows me to share a disk without
> > any fanfare.
> > 
> > Meaning I can do this:
> > 
> > xl block-attach phy:/dev/sda latest1 xvda w
> > xl block-attach phy:/dev/sda latest2 xvda w
> > 
> > while if I had used 'xend' I had to also append the '!' parameter
> > to denote it as 'shared'.
> 
> Do you find that restriction to be valuable in practice?

It protects me from doing silly mistakes.
> 
> Was it ever reliable? How did it cope with /dev/mapper/FOO-BAR
> vs /dev/FOO/BAR and other similar aliases (/dev/cdrom etc)?

I am not sure - but it did work across device mapper.
> 
> We could certainly cause xl to swallow the '!' for compatibility but is
> the feature itself necessary?

Not for Xen 4.4.
> 
> I have a feeling this is mostly implemented by checks in the block
> scripts rather than the toolstack itself, perhaps libxl drives them a
> bit differently.

I can do some investigation for this. After New Year though.

> 
> Ian.
> 

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