Xen devel - Feb 2011 - [PATCH] fix vbd-interface document

Modern PV on HVM kernels map hd* devices to xvd*.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff -r 137ad3347504 docs/misc/vbd-interface.txt
--- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
+++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
@@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
 For Linux HVM guests using PV-on-HVM drivers, users are recommended to
 supply as few hd* devices as possible and use pure xvd* devices for
 the rest.  Modern PV-on-HVM drivers will map the hd* devices to
-/dev/xvdHDa etc.
+/dev/xvd* etc.
 
 Some Linux HVM guests with broken PV-on-HVM drivers do not cope
 properly if both hda and hdc are supplied, nor with both hda and xvda,

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On Wed, 16 Feb 2011, Stefano Stabellini wrote:
> Modern PV on HVM kernels map hd* devices to xvd*.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> 
> diff -r 137ad3347504 docs/misc/vbd-interface.txt
> --- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
> +++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
> @@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
>  For Linux HVM guests using PV-on-HVM drivers, users are recommended to
>  supply as few hd* devices as possible and use pure xvd* devices for
>  the rest.  Modern PV-on-HVM drivers will map the hd* devices to
> -/dev/xvdHDa etc.
> +/dev/xvd* etc.
Sorry I sent it too quicky. It should be:

+/dev/xvda etc.

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On Wed, 2011-02-16 at 17:02 +0000, Stefano Stabellini
wrote:
> Modern PV on HVM kernels map hd* devices to xvd*.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> 
> diff -r 137ad3347504 docs/misc/vbd-interface.txt
> --- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
> +++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
> @@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
>  For Linux HVM guests using PV-on-HVM drivers, users are recommended to
>  supply as few hd* devices as possible and use pure xvd* devices for
>  the rest.  Modern PV-on-HVM drivers will map the hd* devices to
> -/dev/xvdHDa etc.
> +/dev/xvd* etc.
xvdHDa was a proposal which never actually saw the light of day, right?

Otherwise both need mentioning...




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On Wed, 16 Feb 2011, Ian Campbell wrote:
> On Wed, 2011-02-16 at 17:02 +0000, Stefano Stabellini wrote:
> > Modern PV on HVM kernels map hd* devices to xvd*.
> > 
> > Signed-off-by: Stefano Stabellini
<stefano.stabellini@eu.citrix.com>
> > 
> > diff -r 137ad3347504 docs/misc/vbd-interface.txt
> > --- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
> > +++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
> > @@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
> >  For Linux HVM guests using PV-on-HVM drivers, users are recommended
to
> >  supply as few hd* devices as possible and use pure xvd* devices for
> >  the rest.  Modern PV-on-HVM drivers will map the hd* devices to
> > -/dev/xvdHDa etc.
> > +/dev/xvd* etc.
> 
> xvdHDa was a proposal which never actually saw the light of day, right?
> 
right

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On Wed, 2011-02-16 at 17:16 +0000, Stefano Stabellini
wrote:
> On Wed, 16 Feb 2011, Ian Campbell wrote:
> > On Wed, 2011-02-16 at 17:02 +0000, Stefano Stabellini wrote:
> > > Modern PV on HVM kernels map hd* devices to xvd*.
> > > 
> > > Signed-off-by: Stefano Stabellini
<stefano.stabellini@eu.citrix.com>
> > > 
> > > diff -r 137ad3347504 docs/misc/vbd-interface.txt
> > > --- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
> > > +++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
> > > @@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
> > >  For Linux HVM guests using PV-on-HVM drivers, users are
recommended to
> > >  supply as few hd* devices as possible and use pure xvd* devices
for
> > >  the rest.  Modern PV-on-HVM drivers will map the hd* devices to
> > > -/dev/xvdHDa etc.
> > > +/dev/xvd* etc.
> > 
> > xvdHDa was a proposal which never actually saw the light of day,
right?
> > 
> 
> right
Good, then:
Acked-by: Ian Campbell <ian.campbell@citrix.com>



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Stefano Stabellini writes ("Re: [Xen-devel] [PATCH] fix vbd-interface
document"):
> On Wed, 16 Feb 2011, Stefano Stabellini wrote:
> > diff -r 137ad3347504 docs/misc/vbd-interface.txt
> > --- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
> > +++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
> > @@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
> >  For Linux HVM guests using PV-on-HVM drivers, users are recommended
to
> >  supply as few hd* devices as possible and use pure xvd* devices for
> >  the rest.  Modern PV-on-HVM drivers will map the hd* devices to
> > -/dev/xvdHDa etc.
> > +/dev/xvd* etc.
> 
> Sorry I sent it too quicky. It should be:
> 
> +/dev/xvda etc.
I think this could do with some additional explanation and an
adjustment to the recommended setup.  How about this.

Ian.

diff --git a/docs/misc/vbd-interface.txt b/docs/misc/vbd-interface.txt
index ce5ce4f..d97c458 100644
--- a/docs/misc/vbd-interface.txt
+++ b/docs/misc/vbd-interface.txt
@@ -114,9 +114,10 @@ only.  Modern PV drivers will map these to
identically-named devices
 in the guest.
 
 For Linux HVM guests using PV-on-HVM drivers, users are recommended to
-supply as few hd* devices as possible and use pure xvd* devices for
-the rest.  Modern PV-on-HVM drivers will map the hd* devices to
-/dev/xvdHDa etc.
+supply as few hd* devices as possible, and for the rest of the disks,
+to use pure xvd* devices starting at xvde.  Modern PV-on-HVM drivers
+will map provided hd* devices to the corresponding /dev/xvd* (for
+example, hda is presented also as /dev/xvda).
 
 Some Linux HVM guests with broken PV-on-HVM drivers do not cope
 properly if both hda and hdc are supplied, nor with both hda and xvda,

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On Thu, 17 Feb 2011, Ian Jackson wrote:
> Stefano Stabellini writes ("Re: [Xen-devel] [PATCH] fix vbd-interface
document"):
> > On Wed, 16 Feb 2011, Stefano Stabellini wrote:
> > > diff -r 137ad3347504 docs/misc/vbd-interface.txt
> > > --- a/docs/misc/vbd-interface.txt	Mon Feb 14 17:02:55 2011 +0000
> > > +++ b/docs/misc/vbd-interface.txt	Wed Feb 16 16:57:46 2011 +0000
> > > @@ -116,7 +116,7 @@ For Linux HVM guests using PV-on-HVM dri
> > >  For Linux HVM guests using PV-on-HVM drivers, users are
recommended to
> > >  supply as few hd* devices as possible and use pure xvd* devices
for
> > >  the rest.  Modern PV-on-HVM drivers will map the hd* devices to
> > > -/dev/xvdHDa etc.
> > > +/dev/xvd* etc.
> > 
> > Sorry I sent it too quicky. It should be:
> > 
> > +/dev/xvda etc.
> 
> I think this could do with some additional explanation and an
> adjustment to the recommended setup.  How about this.
> 
that''s a good idea


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Stefano Stabellini writes ("Re: [Xen-devel] [PATCH] fix vbd-interface
document"):
> On Thu, 17 Feb 2011, Ian Jackson wrote:
> > I think this could do with some additional explanation and an
> > adjustment to the recommended setup.  How about this.
> > 
> 
> that''s a good idea
Thanks, I''ve applied it.

Ian.

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