Xen users - Feb 2012 - a problem with using qcow2 format image files as virtual disks

Hi,
 
In most cases we use image files as virtual disks under the full-virtualization
situation.On the version 4.1.2 of xen,I do the following command:
############################################################
dd if=/dev/zero of=myraw.img bs=1M seek=8K count=1
#Before the command below I install the operating system in myraw.img
qemu-img-xen create -b myraw.img -f qcow2 myqcow1.img 20000M
qemu-img-xen create -b myqcow1.img -f qcow2 myqcow2.img 20000M
############################################################
Then I use myqcow2.img with a configure file to start a VM,but I failed.After
the command "xl create myqcow2.hvm" is executed,I launch the
application of VNC to connect to the VM.On the display screen of VNC,the error
of "no bootable device found" occured.In the configure file,I
configure the disk like this:
diks = [''tap2:tapdisk:qcow2:/....../myqcow2.img,xvda,w'']
(I also use "diks =
[''tap:qcow2:/....../myqcow2.img,xvda,w'']",but it failed
too)
How could I solve the error of "no bootable device found"?(I think
that maybe my configure of disk is illegal...Here my purpose is that I would
like to create a VM whose disk file is based on a qcow2 format image file.In
another words, I''d like to use several-layer qcow2 format images to
create VMs.)
 
hxk
 

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Hello,

On Wednesday 15 February 2012 14:58:39 hxkhust wrote:
> In most cases we use image files as virtual disks under the
> full-virtualization situation.On the version 4.1.2 of xen,I do the
> following command:
...
> qemu-img-xen create -b myqcow1.img -f qcow2 myqcow2.img 20000M
...
> [''tap2:tapdisk:qcow2:/....../myqcow2.img,xvda,w'']
> (I also use "diks =
[''tap:qcow2:/....../myqcow2.img,xvda,w'']",but it failed
> too)
Last time I checked 
<http://xenbits.xen.org/hg/xen-4.1-testing.hg/file/tip/tools/blktap2/drivers>
blktap2 has no qcow2 support, only qcow1, vhd and some other formats.

Sincerely
Philipp
-- 
Philipp Hahn           Open Source Software Engineer      hahn@univention.de
Univention GmbH        Linux for Your Business        fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
                                                   http://www.univention.de/


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Hi,

At 2012-02-15 22:46:09,"Philipp Hahn" <hahn@univention.de>
wrote:
>Hello,
>
>On Wednesday 15 February 2012 14:58:39 hxkhust wrote:
>> In most cases we use image files as virtual disks under the
>> full-virtualization situation.On the version 4.1.2 of xen,I do the
>> following command:
>...
>> qemu-img-xen create -b myqcow1.img -f qcow2 myqcow2.img 20000M
>...
>> >> (I also use "diks =
[''tap:qcow2:/....../myqcow2.img,xvda,w'']",but it failed
>> too)
>[''tap2:tapdisk:qcow2:/....../myqcow2.img,xvda,w'']
>Last time I checked 
><http://xenbits.xen.org/hg/xen-4.1-testing.hg/file/tip/tools/blktap2/drivers>
>blktap2 has no qcow2 support, only qcow1, vhd and some other formats.
>
>Sincerely
>Philipp
>-- 
>Philipp Hahn           Open Source Software Engineer      hahn@univention.de
>Univention GmbH        Linux for Your Business        fon: +49 421 22 232- 0
>Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
>                                                   http://www.univention.de/
Under that directory there is no block-qcow2.c indeed.With "disk =
[''tap2:tapdisk:qcow2:/....../myqcow1.img,xvda,w'']"
configured in the configure file myqcow1.hvm, however,myqcow1.img could be used
to create a VM just using "xl create myqcow1.hvm".Only myqcow2.img
could not be used to create a VM normally with the error "no bootable
device found" happening.that is weird...
(I just would like to use multi-layer image files to create VMs.Either qcow
format or qcow2 format is right.)
 
hxk

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