Mailing List Archive: Newbie question: "error creating domain: vbd: segment not found"

Newbie question: "error creating domain: vbd: segment not found"

quinton at hoole

Jan 26, 2005, 12:04 AM

Post #1 of 16 (1104 views)

Advance apologies for a potential retransmit – the moderator doesn’t
seem to have got to my previous post yet, so here goes from a registered
account…

I'm following the ttylinux example in section 3.3 of the xen user
manual, and getting the following error:

[root@localhost quintonh]# /usr/sbin/xm create -c
/etc/xen/ttylinux.domain-config-file
Using config file "/etc/xen/ttylinux.domain-config-file".
Error: Error creating domain: vbd: Segment not found:
uname=file:/home/quintonh/Downloads/xen/ttylinux-xen

My domain config file is attached, but essentially looks like this:

kernel = "/boot/vmlinuz-2.6.10-xenU"
memory = 64
name = "ttylinux"
nics=1
ip = "1.2.3.4"
disk = [ 'file:/home/quintonh/Downloads/xen/ttylinux-xen,hdb2,w' ]
root = "/dev/hdb2 ro"

And the file is there:

[root@localhost xen]# pwd
/home/quintonh/Downloads/xen
[root@localhost xen]# ls -als
total 26196
4 drwx------ 3 quintonh quintonh 4096 Jan 25 15:47 .
4 drwx------ 8 quintonh quintonh 4096 Jan 17 16:29 ..
16020 -rw-rw-r-- 1 quintonh quintonh 16384000 Jan 25 14:39 ttylinux-xen

Any ideas?

Q

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Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

quintonh at gmail

Jan 25, 2005, 7:54 AM

Post #2 of 16 (1096 views)

Hi

I'm following the ttylinux example in section 3.3 of the xen user
manual, and getting the following error:

[root@localhost quintonh]# /usr/sbin/xm create -c
/etc/xen/ttylinux.domain-config-file
Using config file "/etc/xen/ttylinux.domain-config-file".
Error: Error creating domain: vbd: Segment not found:
uname=file:/home/quintonh/Downloads/xen/ttylinux-xen

My domain config file is attached, but essentially looks like this:

kernel = "/boot/vmlinuz-2.6.10-xenU"
memory = 64
name = "ttylinux"
nics=1
ip = "1.2.3.4"
disk = [ 'file:/home/quintonh/Downloads/xen/ttylinux-xen,hdb2,w' ]
root = "/dev/hdb2 ro"

And the file is there:

[root@localhost xen]# pwd
/home/quintonh/Downloads/xen
[root@localhost xen]# ls -als
total 26196
4 drwx------ 3 quintonh quintonh 4096 Jan 25 15:47 .
4 drwx------ 8 quintonh quintonh 4096 Jan 17 16:29 ..
16020 -rw-rw-r-- 1 quintonh quintonh 16384000 Jan 25 14:39 ttylinux-xen

Any ideas?

Q

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Re: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

jan.kundrat at fzu

Jan 26, 2005, 8:46 AM

Post #3 of 16 (1094 views)

Quinton Hoole wrote:
> I'm following the ttylinux example in section 3.3 of the xen user
> manual, and getting the following error:
[...]
> disk = [ 'file:/home/quintonh/Downloads/xen/ttylinux-xen,hdb2,w' ]
[...]
> Any ideas?

It takes a while for a mail to pass thru the sf.net mailing list system :-).

You're using file-backed storage, but it seems that you don't have loop
device support compiled into your dom0 kernel. You'll have to enable
CONFIG_BLK_DEV_LOOP in your dom0 kernel configuration and rebuild.

-jkt

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RE: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

quinton at hoole

Jan 27, 2005, 3:04 AM

Post #4 of 16 (1103 views)

> Quinton Hoole wrote:
> > I'm following the ttylinux example in section 3.3 of the xen user
> > manual, and getting the following error:
> [...]
> > disk = [ 'file:/home/quintonh/Downloads/xen/ttylinux-xen,hdb2,w' ]
> [...]
> > Any ideas?
>
> You're using file-backed storage, but it seems that you don't have
loop
> device support compiled into your dom0 kernel. You'll have to enable
> CONFIG_BLK_DEV_LOOP in your dom0 kernel configuration and rebuild.

Thanks, but I'm using the standard XenLinux distribution
(vmlinuz-2.6.10-xen0) which I downloaded from the Xen downloads page a
few weeks back. Surely this has the required loop device support?

Q

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RE: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

quinton at hoole

Jan 28, 2005, 7:39 AM

Post #5 of 16 (1098 views)

Hi Guys

I'm still struggling to get ttylinux running on xen - please see config
files etc below. Can anyone perhaps help? I'm using the bog standard
binaries for both xen and ttylinux downloaded from the xen site. The
only change I've made relative to the tutorial in section 3.3 of the xen
user manual are that my root partition is on /dev/hdb2, and not
/dev/sda1, so my domain config file has been edited appropriately
(/dev/sda1 does not even exist on my system). Am I perhaps confused
here? Should I be using a device other than my dom0 root device?

Thanks in advance...

Q

> -----Original Message-----
> From: Quinton Hoole [mailto:quinton@hoole.biz]
> Sent: 26 January 2005 09:04
> To: 'xen-devel@lists.sourceforge.net'
> Subject: Newbie question: "error creating domain: vbd: segment not
found"
>
> I'm following the ttylinux example in section 3.3 of the xen user
> manual, and getting the following error:
>
> [root@localhost quintonh]# /usr/sbin/xm create -c
/etc/xen/ttylinux.domain-config-file
> Using config file "/etc/xen/ttylinux.domain-config-file".
> Error: Error creating domain: vbd: Segment not found:
> uname=file:/home/quintonh/Downloads/xen/ttylinux-xen
>
> My domain config file is attached, but essentially looks like this:
>
> kernel = "/boot/vmlinuz-2.6.10-xenU"
> memory = 64
> name = "ttylinux"
> nics=1
> ip = "1.2.3.4"
> disk = [ 'file:/home/quintonh/Downloads/xen/ttylinux-xen,hdb2,w' ]
> root = "/dev/hdb2 ro"
>
> And the file is there:
>
> [root@localhost xen]# pwd
> /home/quintonh/Downloads/xen
> [root@localhost xen]# ls -als
> total 26196
> 4 drwx------ 3 quintonh quintonh 4096 Jan 25 15:47 .
> 4 drwx------ 8 quintonh quintonh 4096 Jan 17 16:29 ..
> 16020 -rw-rw-r-- 1 quintonh quintonh 16384000 Jan 25 14:39
ttylinux-xen
>
> Any ideas?
>
> Q
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.7.4 - Release Date: 2005/01/25
>

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RE: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

jan.kundrat at fzu

Jan 28, 2005, 8:23 AM

Post #6 of 16 (1101 views)

On 2005-01-27, 12:04, Quinton Hoole wrote:

> > Quinton Hoole wrote:
> > > I'm following the ttylinux example in section 3.3 of the xen user
> > > manual, and getting the following error:
> > [...]
> > > disk = [ 'file:/home/quintonh/Downloads/xen/ttylinux-xen,hdb2,w' ]
> > [...]
> > > Any ideas?
> >
> > You're using file-backed storage, but it seems that you don't have
> loop
> > device support compiled into your dom0 kernel. You'll have to enable
> > CONFIG_BLK_DEV_LOOP in your dom0 kernel configuration and rebuild.
>
> Thanks, but I'm using the standard XenLinux distribution
> (vmlinuz-2.6.10-xen0) which I downloaded from the Xen downloads page a
> few weeks back. Surely this has the required loop device support?

I don't know. Are you able to mount some disk image from inside of dom0?
Something like `mount /path/to/image.iso /mnt/iso -t iso9660 -o loop,ro`,
where /path/to/image.iso is ISO image of CD-ROM?
Does `losetup` work?

-jkt

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Re: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

Mark.Williamson at cl

Jan 28, 2005, 9:11 AM

Post #7 of 16 (1094 views)

> Thanks, but I'm using the standard XenLinux distribution
> (vmlinuz-2.6.10-xen0) which I downloaded from the Xen downloads page a
> few weeks back. Surely this has the required loop device support?

Can you check that you have the losetup command available on your system and
that it works OK?

Try:
losetup /dev/loop0 /home/quintonh/Downloads/xen/ttylinux-xen

And then change the VBD to refer to 'phy:/dev/loop0' instead of 'file:...'.

(assuming that works, you can remove the loop mapping after stopping the
domain using 'losetup -d /dev/loop0)

Cheers,
Mark

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Re: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

Mark.Williamson at cl

Jan 28, 2005, 9:55 AM

Post #8 of 16 (1096 views)

> Marvellous! Fixed.

So the commands I showed just worked but the file: uname didn't? You didn't
have to install any packages to make it work?

Cheers,
Mark

> Thanks
>
> Q
>
> > -----Original Message-----
> > From: maw48@hermes.cam.ac.uk [mailto:maw48@hermes.cam.ac.uk] On Behalf
>
> Of Mark Williamson
>
> > Sent: 28 January 2005 18:12
> > To: xen-devel@lists.sourceforge.net
> > Cc: Quinton Hoole; 'Jan Kundrát'
> > Subject: Re: [Xen-devel] Newbie question: "error creating domain: vbd:
>
> segment not found"
>
> > > Thanks, but I'm using the standard XenLinux distribution
> > > (vmlinuz-2.6.10-xen0) which I downloaded from the Xen downloads page
>
> a
>
> > > few weeks back. Surely this has the required loop device support?
> >
> > Can you check that you have the losetup command available on your
>
> system and
>
> > that it works OK?
> >
> > Try:
> > losetup /dev/loop0 /home/quintonh/Downloads/xen/ttylinux-xen
> >
> > And then change the VBD to refer to 'phy:/dev/loop0' instead of
>
> 'file:...'.
>
> > (assuming that works, you can remove the loop mapping after stopping
>
> the
>
> > domain using 'losetup -d /dev/loop0)
> >
> > Cheers,
> > Mark
> >
> >
> > --
> > No virus found in this incoming message.
> > Checked by AVG Anti-Virus.
> > Version: 7.0.300 / Virus Database: 265.7.5 - Release Date: 2005/01/26

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RE: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

quinton at hoole

Jan 28, 2005, 10:00 AM

Post #9 of 16 (1100 views)

Marvellous! Fixed.

Thanks

Q

> -----Original Message-----
> From: maw48@hermes.cam.ac.uk [mailto:maw48@hermes.cam.ac.uk] On Behalf
Of Mark Williamson
> Sent: 28 January 2005 18:12
> To: xen-devel@lists.sourceforge.net
> Cc: Quinton Hoole; 'Jan Kundrát'
> Subject: Re: [Xen-devel] Newbie question: "error creating domain: vbd:
segment not found"
>
> > Thanks, but I'm using the standard XenLinux distribution
> > (vmlinuz-2.6.10-xen0) which I downloaded from the Xen downloads page
a
> > few weeks back. Surely this has the required loop device support?
>
> Can you check that you have the losetup command available on your
system and
> that it works OK?
>
> Try:
> losetup /dev/loop0 /home/quintonh/Downloads/xen/ttylinux-xen
>
> And then change the VBD to refer to 'phy:/dev/loop0' instead of
'file:...'.
>
> (assuming that works, you can remove the loop mapping after stopping
the
> domain using 'losetup -d /dev/loop0)
>
> Cheers,
> Mark
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.300 / Virus Database: 265.7.5 - Release Date: 2005/01/26
>

--
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Re: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

Jan 28, 2005, 1:24 PM

Post #10 of 16 (1093 views)

I've seen this problem occur before when I destroy a domain through a
non-xm tool (sending control messages myself). I think it's some sort
of dead-lock but I cannot reproduce it reliably.

Rebooting always fixes the problem for me.

Regards,

On Fri, 2005-01-28 at 10:55, Mark Williamson wrote:
> > Marvellous! Fixed.
>
> So the commands I showed just worked but the file: uname didn't? You didn't
> have to install any packages to make it work?
>
> Cheers,
> Mark
>
> > Thanks
> >
> > Q
> >
> > > -----Original Message-----
> > > From: maw48@hermes.cam.ac.uk [mailto:maw48@hermes.cam.ac.uk] On Behalf
> >
> > Of Mark Williamson
> >
> > > Sent: 28 January 2005 18:12
> > > To: xen-devel@lists.sourceforge.net
> > > Cc: Quinton Hoole; 'Jan Kundrát'
> > > Subject: Re: [Xen-devel] Newbie question: "error creating domain: vbd:
> >
> > segment not found"
> >
> > > > Thanks, but I'm using the standard XenLinux distribution
> > > > (vmlinuz-2.6.10-xen0) which I downloaded from the Xen downloads page
> >
> > a
> >
> > > > few weeks back. Surely this has the required loop device support?
> > >
> > > Can you check that you have the losetup command available on your
> >
> > system and
> >
> > > that it works OK?
> > >
> > > Try:
> > > losetup /dev/loop0 /home/quintonh/Downloads/xen/ttylinux-xen
> > >
> > > And then change the VBD to refer to 'phy:/dev/loop0' instead of
> >
> > 'file:...'.
> >
> > > (assuming that works, you can remove the loop mapping after stopping
> >
> > the
> >
> > > domain using 'losetup -d /dev/loop0)
> > >
> > > Cheers,
> > > Mark
> > >
> > >
> > > --
> > > No virus found in this incoming message.
> > > Checked by AVG Anti-Virus.
> > > Version: 7.0.300 / Virus Database: 265.7.5 - Release Date: 2005/01/26
>
>
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--
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Linux Technology Center (LTC) - IBM Austin
E-mail: aliguori@us.ibm.com
Phone: (512) 838-1208

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RE: Newbie question: "error creating domain: vbd:segment not found" [ In reply to ]

quinton at hoole

Jan 29, 2005, 12:46 AM

Post #11 of 16 (1091 views)

> From: Anthony Liguori [mailto:aliguori@us.ibm.com]
> I've seen this problem occur before when I destroy a domain through a
> non-xm tool (sending control messages myself). I think it's some sort
> of dead-lock but I cannot reproduce it reliably.
>
> Rebooting always fixes the problem for me.

Not in my case. I tried that. Just shout if there's any other info I
can send you to make sense of it. Note that I'm a relative newbie to
Linux devices, so it might be something pretty trivial. See in
particular my comments yesterday re: my root device:

"my root partition is on /dev/hdb2, and not /dev/sda1, so my domain
config file has been edited appropriately (/dev/sda1 does not even exist
on my system). Am I perhaps confused here? Should I be using a device
other than my dom0 root device?"

Q

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Re: Newbie question: "error creating domain: vbd:segment not found" [ In reply to ]

Ian.Pratt at cl

Jan 29, 2005, 2:41 AM

Post #12 of 16 (1094 views)

> "my root partition is on /dev/hdb2, and not /dev/sda1, so my domain
> config file has been edited appropriately (/dev/sda1 does not even exist
> on my system). Am I perhaps confused here? Should I be using a device
> other than my dom0 root device?"

Yes!

Each domain needs its own root file system.

Ian

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RE: Newbie question: "error creating domain: vbd: segment not found" [ In reply to ]

quinton at hoole

Jan 29, 2005, 4:37 AM

Post #13 of 16 (1091 views)

Mark Williamson wrote>
> So the commands I showed just worked but the file: uname didn't? You
didn't
> have to install any packages to make it work?
>

Yes, that's correct. Losetup worked, and the VM boots with
phy:/dev/loop0. No additional packages required.

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RE: Newbie question: "error creating domain: vbd:segment not found" [ In reply to ]

quinton at hoole

Jan 29, 2005, 4:44 AM

Post #14 of 16 (1091 views)

Yep - that's what I guessed. But using

disk = ['file:/path/to/ttylinux/rootfs,sda1,w']

as in the tutorial failed ("device not found" from what I recall). But
changing sda1 to hdb2 got around that problem, albeit the wrong
approach, I assume.

Q

> -----Original Message-----
> From: xen-devel-admin@lists.sourceforge.net
[mailto:xen-devel-admin@lists.sourceforge.net] On
> Behalf Of Ian Pratt
> Sent: 29 January 2005 11:42
> To: Quinton Hoole
> Cc: 'Anthony Liguori'; 'Mark Williamson';
xen-devel@lists.sourceforge.net; 'Jan Kundrat';
> Ian.Pratt@cl.cam.ac.uk
> Subject: Re: [Xen-devel] Newbie question: "error creating domain:
vbd:segment not found"
>
>
> > "my root partition is on /dev/hdb2, and not /dev/sda1, so my domain
> > config file has been edited appropriately (/dev/sda1 does not even
exist
> > on my system). Am I perhaps confused here? Should I be using a
device
> > other than my dom0 root device?"
>
> Yes!
>
> Each domain needs its own root file system.
>
> Ian
>
>
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Reporting
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>
>
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Re: Newbie question: "error creating domain: vbd:segment not found" [ In reply to ]

Mark.Williamson at cl

Jan 29, 2005, 6:43 AM

Post #15 of 16 (1094 views)

> disk = ['file:/path/to/ttylinux/rootfs,sda1,w']
>
> as in the tutorial failed ("device not found" from what I recall). But
> changing sda1 to hdb2 got around that problem, albeit the wrong
> approach, I assume.

Ah, that'll break if you don't have a /dev/sda1 to lookup in dom1. Changing
"sda1" to "0801" should work (I think this issue is fixed in the testing
tree)

Cheers,
Mark

>
> Q
>
> > -----Original Message-----
> > From: xen-devel-admin@lists.sourceforge.net
>
> [mailto:xen-devel-admin@lists.sourceforge.net] On
>
> > Behalf Of Ian Pratt
> > Sent: 29 January 2005 11:42
> > To: Quinton Hoole
> > Cc: 'Anthony Liguori'; 'Mark Williamson';
>
> xen-devel@lists.sourceforge.net; 'Jan Kundrat';
>
> > Ian.Pratt@cl.cam.ac.uk
> > Subject: Re: [Xen-devel] Newbie question: "error creating domain:
>
> vbd:segment not found"
>
> > > "my root partition is on /dev/hdb2, and not /dev/sda1, so my domain
> > > config file has been edited appropriately (/dev/sda1 does not even
>
> exist
>
> > > on my system). Am I perhaps confused here? Should I be using a
>
> device
>
> > > other than my dom0 root device?"
> >
> > Yes!
> >
> > Each domain needs its own root file system.
> >
> > Ian
> >
> >
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> >
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RE: Newbie question: "error creating domain: vbd:segment not found" [ In reply to ]

quinton at hoole

Jan 31, 2005, 2:08 AM

Post #16 of 16 (1098 views)

>
> > disk = ['file:/path/to/ttylinux/rootfs,sda1,w']
> >
> > as in the tutorial failed ("device not found" from what I recall).
But
> > changing sda1 to hdb2 got around that problem, albeit the wrong
> > approach, I assume.
>
> Ah, that'll break if you don't have a /dev/sda1 to lookup in dom1.
Changing
> "sda1" to "0801" should work (I think this issue is fixed in the
testing
> tree)

Hmmm - sadly not. I've tried "0801", but I get the error:

"Error creating domain: vbd: Segment not found:
uname=file:/home/quintonh/Downloads/xen/ttylinux-xen"

Config file is now identical to that given in the manual, except with
"sda1" replaced by "0801" in both places. As before, using
off-the-shelf downloaded builds of xen and ttylinux-xen.

Q

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