Re: [Xen-users] Using diskOnKey as additional disk - is it possible with default configuration?

["Ian Brown" <ianbrn@xxxxxxxxx>]

Mark,
 Sorry but your suggestion **DOES NOT** change the results.

However, I tried the other suggestion, by Luke S. Crawford; it **DOES** work !
namely , after setting:
disk = [ 'tap:aio:/var/lib/xen/images/guest10/guest10File,xvda,w',
      'phy:/dev/sdb,xvdb,w' ]
and booting domU I fet with fdisk -l:

fdisk -l

Disk /dev/xvda: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/xvda1   *           1          13      104391   83  Linux
/dev/xvda2              14         446     3478072+  83  Linux
/dev/xvda3             447         515      554242+  82  Linux swap / Solaris
/dev/xvda4             516         522       56227+   5  Extended
/dev/xvda5             516         522       56196   8e  Linux LVM

Disk /dev/xvdb: 65 MB, 65470464 bytes
255 heads, 63 sectors/track, 7 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/xvdb doesn't contain a valid partition table


Regards,
Ian

On 4/2/07, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
> >
> > Hmm. So you're trying to see a disk as a partition?
> >
> > 'phy:/dev/sdb,sda6,w'
> >
> > (sdb -> sda6: sdb is a disk, sda6 is "partition six of device sda").
> >
>
> This also stuck out to me - it seems like a slightly strange thing to do, but
> I can't actually see why it wouldn't work.
>
> However if you're actually hoping to get any data off this you may have less
> luck, since the guest definitely won't expect to find a partition table (the
> USB disk's partition table) inside a partition (the sda6 you are exporting
> as).  What are you trying to achieve?  Why not export the whole USB stick,
> eg.
>
> 'phy:sdb,sda,w'
>
> Cheers,
> Mark
>
> > I'm not saying this is what's wrong, but as far as I know, the Xen-guest
> > will not have any clue what type of device it is (hence we can use a
> > file as a guest-image). So it shouldn't matter if it's a USB-stick,
> > SCSI-disk or whatever else you can imagine as a "hard-disk". It's most
> > likely some details, rather than the overall concept, that is causing it
> > to not work. But there's a whole lot of different permutations, so it
> > may take a while to figure it out.
> >
> > --
> > Mats
> >
> > > Regards,
> > > Ian
> > >
> > > On 4/2/07, Petersson, Mats <Mats.Petersson@xxxxxxx> wrote:
> > > > > -----Original Message-----
> > > > > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > > > > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf
> > >
> > > Of Ian Brown
> > >
> > > > > Sent: 02 April 2007 10:57
> > > > > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > > > > Subject: [Xen-users] Using diskOnKey as additional disk - is
> > > > > it possible with default configuration?
> > > > >
> > > > > Hello,
> > > > >  I try the following:
> > > > > I have in the configDomU file the following:
> > > > >
> > > > > disk = [ 'tap:aio:/var/lib/xen/images/guest10/guest10File]
> > > > >
> > > > > which works OK; I can start domU by "xm create -c configDomU.
> > > > >
> > > > >
> > > > > Now, my question is: can I add an additional USB DiskOnKey as a
> > > > > physical device ?
> > > > > What I tried is:
> > > > > First I added mknod /dev/sda6 b 8 6 in domU.
> > > > > Then I added to the configDomU file:
> > > > > disk = [ 'tap:aio:/var/lib/xen/images/guest10/guest10File,xvda,w'
> > > > > ,'phy:/dev/sdb,sda6,w' ]
> > > > >
> > > > > /dev/sdb is the device of teh USB DiskOnKey and **it is
> > >
> > > unmounted**.
> > >
> > > > > and start domU.
> > > > > "fdisk -l" does not show any new device. (I expected to see
> > > > > /dev/sda6).
> > > > >   (Of course that the /dev/xvda for guest10File exists)
> > > > >
> > > > > When I try to do the following:
> > > > >
> > > > >       disk = [
> > > > > 'tap:aio:/var/lib/xen/images/guest10/guest10File,xvda,w'
> > > > > ,'phy:/dev/sda7,sda6,w' ]
> > > > >
> > > > > where /dev/sda7 is an unmounted partition in dom0, than after
> > > > > starting domU I am **able** to see with
> > > > >
> > > > > "fdisk -l " the /dev/sda6 device.
> > > > >
> > > > > Is it something to do with that it can't add additional disk
> > > > > if it is a USB ?
> > > > >
> > > > > Regards,
> > > > > Ian
> > > >
> > > > I'm by no means an expert on this, but is it by any chance that you
> > > > shouldn't use "sda" but rather "hda" for the export name?
> > >
> > > Bear in mind
> > >
> > > > that the guest doesn't actually know (or cares) what
> > >
> > > PHYSICAL device it
> > >
> > > > is talking to, but it has to hook onto it in some way, and I seem to
> > > > remember something similar before. Worth a try, I should think.
> > > >
> > > > --
> > > > Mats
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
>
> --
> 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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