Xen users - Nov 2007 - Problem with export of physical devices to domU

Hi,

I am trying to get a domU working with pyhsical devices exported from 
dom0, but the boot of domU always fails with the following message in VNC:

[..]
Booting from Hard Disk...
Boot from Hard Disk failed: could not read the boot disk
FATAL: No bootable device

Xen 3.1.0 was installed from source and is running under Debian Etch. 
Kernel Version 2.6.18. On the device, which I want to export is also a 
Debian Etch installed.
The config of the domU looks like the following:

import os, re
arch = os.uname()[4]
if re.search(''64'', arch):
     arch_libdir = ''lib64''
else:
     arch_libdir = ''lib''
kernel = "/usr/lib/xen/boot/hvmloader"
builder=''hvm''
memory = 1024
name = "ExampleHVMDomain"
vif = [ ''type=ioemu, bridge=xenbr0'' ]
disk = [ ''phy:/dev/sdb1,ioemu:sda1,w'' ]
device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''
boot="c"
sdl=0
vnc=1
vncpasswd=''''
stdvga=0
serial=''pty''

I already tried a lot of different values for disk, but each try ends 
with the same message. Example tries:

disk = [ ''phy:/dev/sdb1,sda1,w'' ]
disk = [ ''phy:/dev/sdb,ioemu:sda,w'' ]
disk = [ ''phy:/dev/sdb,ioemu:sda,w'',
''phy:/dev/sdb1,ioemu:sda1,w''  ]
disk = [ ''phy:sdb1,ioemu:sda1,w'' ]

I think I just made a beginner''s mistake and I hope someone is able to 
point me in the right direction. If you need any further information, 
please let me know.

Thanks in advance.

Jan Marquardt

-- 
Artfiles New Media GmbH | Spaldingstr. 160 b | 20097 Hamburg
Tel: 040 - 32 02 72 90 | Fax: 040 - 32 02 72 95
E-Mail: support@artfiles.de | Web: http://www.artfiles.de
Geschäftsführer Carsten Bals | Handelsregister Hamburg - HRB 81478

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Jan Marquardt írta:
> Hi,
>
> I am trying to get a domU working with pyhsical devices exported from 
> dom0, but the boot of domU always fails with the following message in 
> VNC:
>
> [..]
> Booting from Hard Disk...
> Boot from Hard Disk failed: could not read the boot disk
> FATAL: No bootable device
>
> Xen 3.1.0 was installed from source and is running under Debian Etch. 
> Kernel Version 2.6.18. On the device, which I want to export is also a 
> Debian Etch installed.
> The config of the domU looks like the following:
>
> import os, re
> arch = os.uname()[4]
> if re.search(''64'', arch):
>     arch_libdir = ''lib64''
> else:
>     arch_libdir = ''lib''
> kernel = "/usr/lib/xen/boot/hvmloader"
> builder=''hvm''
> memory = 1024
> name = "ExampleHVMDomain"
> vif = [ ''type=ioemu, bridge=xenbr0'' ]
> disk = [ ''phy:/dev/sdb1,ioemu:sda1,w'' ]
> device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''
> boot="c"
> sdl=0
> vnc=1
> vncpasswd=''''
> stdvga=0
> serial=''pty''
>
> I already tried a lot of different values for disk, but each try ends 
> with the same message. Example tries:
>
> disk = [ ''phy:/dev/sdb1,sda1,w'' ]
> disk = [ ''phy:/dev/sdb,ioemu:sda,w'' ]
> disk = [ ''phy:/dev/sdb,ioemu:sda,w'',
''phy:/dev/sdb1,ioemu:sda1,w''  ]
> disk = [ ''phy:sdb1,ioemu:sda1,w'' ]
>
> I think I just made a beginner''s mistake and I hope someone is
able to
> point me in the right direction. If you need any further information, 
> please let me know.
>
> Thanks in advance.
>
> Jan Marquardt
>
I supose you installed a paravirtualized guest in that case you do need 
to specify kernel=/path/to/your/DomU/kernel/in/the/Dom0/filesystem
and builder=linux
If you installed a hvm domain, then the install obviously failed, and 
you need to reinstall it.

Good Luck

Geza Gemes

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Jan Marquardt wrote:
> Hi,
>
> I am trying to get a domU working with pyhsical devices exported from 
> dom0, but the boot of domU always fails with the following message in 
> VNC:
>
> [..]
> Booting from Hard Disk...
> Boot from Hard Disk failed: could not read the boot disk
> FATAL: No bootable device
>
> Xen 3.1.0 was installed from source and is running under Debian Etch. 
> Kernel Version 2.6.18. On the device, which I want to export is also a 
> Debian Etch installed.
> The config of the domU looks like the following:
>
> import os, re
> arch = os.uname()[4]
> if re.search(''64'', arch):
>     arch_libdir = ''lib64''
> else:
>     arch_libdir = ''lib''
> kernel = "/usr/lib/xen/boot/hvmloader"
> builder=''hvm''
> memory = 1024
> name = "ExampleHVMDomain"
> vif = [ ''type=ioemu, bridge=xenbr0'' ]
> disk = [ ''phy:/dev/sdb1,ioemu:sda1,w'' ]
I suspect scsi emulation is actually supported. You should have to use 
IDE emulation.

disk = [ ''phy:/dev/sdb1,ioemu:hda1,w'' ]

--Sadique
> device_model = ''/usr/'' + arch_libdir +
''/xen/bin/qemu-dm''
> boot="c"
> sdl=0
> vnc=1
> vncpasswd=''''
> stdvga=0
> serial=''pty''
>
> I already tried a lot of different values for disk, but each try ends 
> with the same message. Example tries:
>
> disk = [ ''phy:/dev/sdb1,sda1,w'' ]
> disk = [ ''phy:/dev/sdb,ioemu:sda,w'' ]
> disk = [ ''phy:/dev/sdb,ioemu:sda,w'',
''phy:/dev/sdb1,ioemu:sda1,w''  ]
> disk = [ ''phy:sdb1,ioemu:sda1,w'' ]
>
> I think I just made a beginner''s mistake and I hope someone is
able to
> point me in the right direction. If you need any further information, 
> please let me know.
>
> Thanks in advance.
>
> Jan Marquardt
>

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Thanks for your fast replies.

Sorry that I forgot to mention that we want use hvm. If I switch to 
paravirtualization, the domU boots without any problem with the modified 
kernel.

Changing the disk variable to the following changes nothing.
disk = [ ''phy:/dev/sdb1,ioemu:hda1,w'' ]

Regards,

Jan Marquardt

-- 
Artfiles New Media GmbH | Spaldingstr. 160 b | 20097 Hamburg
Tel: 040 - 32 02 72 90 | Fax: 040 - 32 02 72 95
E-Mail: support@artfiles.de | Web: http://www.artfiles.de
Geschäftsführer Carsten Bals | Handelsregister Hamburg - HRB 81478

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Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

If I''m not wrong, exporting a device with ioemu makes it behave like a
hard
disk. Therefore, boot sector and partitions must exist inside this /dev/sdb1
(like a complete disk image) in order for you to boot.

Emre


On Nov 27, 2007 11:07 AM, Jan Marquardt <jm@artfiles.de> wrote:
> Thanks for your fast replies.
>
> Sorry that I forgot to mention that we want use hvm. If I switch to
> paravirtualization, the domU boots without any problem with the modified
> kernel.
>
> Changing the disk variable to the following changes nothing.
> disk = [ ''phy:/dev/sdb1,ioemu:hda1,w'' ]
>
> Regards,
>
> Jan Marquardt
>
> --
> Artfiles New Media GmbH | Spaldingstr. 160 b | 20097 Hamburg
> Tel: 040 - 32 02 72 90 | Fax: 040 - 32 02 72 95
> E-Mail: support@artfiles.de | Web: http://www.artfiles.de
> Geschäftsführer Carsten Bals | Handelsregister Hamburg - HRB 81478
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>


-- 
Emre Erenoglu
erenoglu@gmail.com


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Emre Erenoglu wrote:
> If I''m not wrong, exporting a device with ioemu makes it behave
like a hard
> disk. Therefore, boot sector and partitions must exist inside this
/dev/sdb1
> (like a complete disk image) in order for you to boot.
> 
> Emre
It is possible to boot the hard disk, which should be booted by the 
domU, as standalone. Though everything necessary should be available I 
think.

Regards,

Jan

-- 
Artfiles New Media GmbH | Spaldingstr. 160 b | 20097 Hamburg
Tel: 040 - 32 02 72 90 | Fax: 040 - 32 02 72 95
E-Mail: support@artfiles.de | Web: http://www.artfiles.de
Geschäftsführer Carsten Bals | Handelsregister Hamburg - HRB 81478

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I just solved the issue. The following disk configuration works:

disk = [ ''phy:/dev/sdb,ioemu:hda,w'' ]

Thanks a lot for all your hints.

Regards,

Jan

-- 
Artfiles New Media GmbH | Spaldingstr. 160 b | 20097 Hamburg
Tel: 040 - 32 02 72 90 | Fax: 040 - 32 02 72 95
E-Mail: support@artfiles.de | Web: http://www.artfiles.de
Geschäftsführer Carsten Bals | Handelsregister Hamburg - HRB 81478

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