Re: [Xen-users] blktap on debian

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

Nb.  just to clarify, you do not need the blktap module in the domU kernel.  
From the guest's PoV there's no difference.

Cheers,
Mark

On Saturday 14 April 2007 23:46, Itamar Reis Peixoto wrote:
> after changing your kernel config
>
> CONFIG_XEN_BLKDEV_TAP=m
>
> config should be
>
> disk    = [ 'tap:aio:/var/xen/domains/ac/disk.img,xvda1,w',
> 'tap:aio:/var/xen/domains/ac/swap.img,xvda2,w' ]
>
> update your fstab of domU too.
>
> for me works fine with this config.
>
> --------------------
>
> Itamar Reis Peixoto
>
> e-mail: itamar@xxxxxxxxxxxxxxxx
> msn: itamarjp@xxxxxxxxxxxxx
> skype: itamarjp
> icq: 81053601
> +55 34 3238 3845
> +55 11 4063 5033
> ----- Original Message -----
> From: "Daniel P. Berrange" <berrange@xxxxxxxxxx>
> To: "Jonathan Selander" <jonathan@xxxxxxxxx>
> Cc: <xen-users@xxxxxxxxxxxxxxxxxxx>
> Sent: Saturday, April 14, 2007 8:35 PM
> Subject: Re: [Xen-users] blktap on debian
>
> > On Sat, Apr 14, 2007 at 11:54:06PM +0200, Jonathan Selander wrote:
> >> Hello,
> >>
> >> I run xen 3.0.3 on Debian 4.0 and so far I've got 5 guests. I've read in
> >> the user documentation that it's better to use blktap than loopback,
> >> because of performance reasons, so i decided to switch to it. However,
> >> the root device isn't found by the guest system. I read something about
> >> CONFIG_XEN_BLKDEV_TAP being needed in the kernel for it to work, is that
> >> true? I have
> >>
> >> CONFIG_XEN_BLKDEV_BACKEND=y
> >> # CONFIG_XEN_BLKDEV_TAP is not set
> >> CONFIG_XEN_BLKDEV_FRONTEND=y
> >
> > Yeah, I believe it should be set to
> >
> >  CONFIG_XEN_BLKDEV_TAP=m
> >
> > If it was working, you'd also get a 'blktapctrl' daemon spawned by Xen.
> > If you look at syslog you'll probably find blktapctrl trying to start and
> > failing to initialize if blktap support was missing in kernel.
> >
> >> The guest config disk line looks like this:
> >>
> >> disk    = [ 'tap:aio:/var/xen/domains/ac/disk.img,sda1,w',
> >> 'tap:aio:/var/xen/domains/ac/swap.img,sda2,w' ]
> >
> > That's the correct config file syntax.
> >
> > Dan.
> > --
> >
> > |=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392
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-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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