Re: [Xen-users] tap instead of file

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

Randy McAnally wrote:
>
> Thanks for that info.  So it appears that TAP does not work with HVM
> domains.
>

Using file:/xxx/xx for hvms doesn't have all the pitfalls that pv guests
have while using it. The code is entirely different for storage handling
with file:/ for pv and fv. So it's safe to use file:/ for hvms while
it's not for PV. Until recently tap:aio is not supported for hvms, not
sure whether this has changed in latest versions or not.

--Sadique

> Is this true for newer versions?  Unfortunately this box is in heavy
> production so I cannot upgrade it right now.
>
> -- 
> Randy
> www.FastServ.com <http://www.fastserv.com/>
>
> *---------- Original Message -----------*
> From: "Lane Bryson" <lane.bryson@xxxxxxxxx>
> To: "Randy McAnally" <rsm@xxxxxxxxxxxxx>
> Cc: deshantm@xxxxxxxxx, Omer Khalid <Omer.Khalid@xxxxxxx>, xen-users
> list <xen-users@xxxxxxxxxxxxxxxxxxx>
> Sent: Fri, 29 Aug 2008 07:32:36 -0500
> Subject: Re: [Xen-users] tap instead of file
>
> > on the same dom0, a CentOS 5.2 x86_64 PV domU works fine.  (just
> changed disk definition from phy: to tap:aio; tried with both lvm and
> raw file).
> >
> > On Thu, Aug 28, 2008 at 4:19 PM, Randy McAnally <rsm@xxxxxxxxxxxxx
> <mailto:rsm@xxxxxxxxxxxxx>> wrote:
> >
>
>
>     >
>     > Has anyone tried other modes?  Is it HVM that is killing it, or
>     is it simply being 64 bit?  Does it work at all in other modes?
>     > Interesting that I'm using the Xen provided kernel and you're
>     using the Redhat Xen kernel.  Seems that it might not be a kernel
>     issue; perhaps a qemu problem.
>     >
>     > --
>     > Randy
>     > www.FastServ.com <http://www.fastserv.com/>
>     >
>     >
>     > *---------- Original Message -----------*
>     > From: "Omer Khalid" <Omer.Khalid@xxxxxxx>
>     > To: "Randy McAnally" <rsm@xxxxxxxxxxxxx <mailto:rsm@xxxxxxxxxxxxx>>
>     >
>     > Cc: deshantm@xxxxxxxxx <mailto:deshantm@xxxxxxxxx>, xen-users
>     list <xen-users@xxxxxxxxxxxxxxxxxxx
>     <mailto:xen-users@xxxxxxxxxxxxxxxxxxx>>
>     > Sent: Thu, 28 Aug 2008 22:01:21 +0200
>     > Subject: Re: [Xen-users] tap instead of file
>     >
>     > > Hi Randy,
>     > >
>     > > I got exactly the same problem with an HVM 64bit guest on 64
>     bit host. The snap shot you attached previously is what I get too :-(
>     > >
>     > > The rest of the thread is here:
>     > >
>     http://lists.xensource.com/archives/html/xen-users/2008-08/msg00786.html
>
>     >
>     > >
>     > > I also saw few other people on the list having the same
>     problem but no solution so far! It would be nice to get a solution
>     to this with out jumping to another Xen version.
>     > >
>     > > Cheers
>     > > Omer
>     > >
>     > > On Thu, Aug 28, 2008 at 1:07 AM, Randy McAnally
>     <rsm@xxxxxxxxxxxxx <mailto:rsm@xxxxxxxxxxxxx>> wrote:
>     > >
>     >
>     >
>
>         EL5 x86_64
>         > > Xen 3.1.4 (from xenbits)
>         > > Xen compiled kernel:
>         > > Linux ***************** 2.6.18.8-xen #1 SMP Fri Jun 6
>         11:33:22 EDT 2008
>         > > x86_64 x86_64 x86_64 GNU/Linux
>         > >
>         > > --
>         > > Randy
>         > > www.FastServ.com <http://www.fastserv.com/>
>         > >
>         > > ---------- Original Message -----------
>         > > From: "Todd Deshane" <deshantm@xxxxxxxxx
>         <mailto:deshantm@xxxxxxxxx>>
>         > > To: "Randy McAnally" <rsm@xxxxxxxxxxxxx
>         <mailto:rsm@xxxxxxxxxxxxx>>
>         > > Cc: xen-users list <xen-users@xxxxxxxxxxxxxxxxxxx
>         <mailto:xen-users@xxxxxxxxxxxxxxxxxxx>>
>         > >
>         > > Sent: Wed, 27 Aug 2008 18:43:51 -0400
>         > > Subject: Re: [Xen-users] tap instead of file
>         > >
>         > > > On Wed, Aug 27, 2008 at 6:18 PM, Randy McAnally
>         <rsm@xxxxxxxxxxxxx <mailto:rsm@xxxxxxxxxxxxx>> wrote:
>         > > > > OK, that's what I thought.  However, it fails.   I
>         have attached an image
>         > > of
>         > > > > the POST screen (this is an HVM domain).
>         > > > >
>         > > > > --
>         > > > What is your Xen version, kernel version, and distro?
>         > > >
>         > > > Cheers,
>         > > > Todd
>         > > >
>         > > > --
>         > > > Todd Deshane
>         > > > http://todddeshane.net <http://todddeshane.net/>
>         > > > check out our book: http://runningxen.com
>         <http://runningxen.com/>
>         > > >
>         > > > _______________________________________________
>         > > > Xen-users mailing list
>         > > > Xen-users@xxxxxxxxxxxxxxxxxxx
>         <mailto:Xen-users@xxxxxxxxxxxxxxxxxxx>
>         > > > http://lists.xensource.com/xen-users
>         > > ------- End of Original Message -------
>         > >
>         > > _______________________________________________
>         > > Xen-users mailing list
>         > > Xen-users@xxxxxxxxxxxxxxxxxxx
>         <mailto:Xen-users@xxxxxxxxxxxxxxxxxxx>
>         > > http://lists.xensource.com/xen-users
>         > > 
>
>
>     > >
>
>     > > --
>     > > Omer
>     > >
>     > > -------------------------------------------------------
>     > > CERN -- European Organization for Nuclear
>     > > Research, IT Department, CH-1211,
>     > > Geneva 23, Switzerland
>     > >
>     > > Phone: +41 (0) 22 767 2224
>     > > Fax: +41 (0) 22 766 8683
>     > > E-mail : Omer.Khalid@xxxxxxx
>     > > Homepage: http://cern.ch/Omer.Khalid
>     > *------- End of Original Message -------*
>     >
>     > _______________________________________________
>     > Xen-users mailing list
>     > Xen-users@xxxxxxxxxxxxxxxxxxx
>     <mailto:Xen-users@xxxxxxxxxxxxxxxxxxx>
>     > http://lists.xensource.com/xen-users
>     > 
>
>
> *------- End of Original Message -------*
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users