Xen users - Apr 2006 - Error: Device 2049 (vbd) could not be connected. Backend device not found.

Hey guys,

I''ve installed xen 3 and xen-tools on my ubuntu server and all seems  
well, until I try to start a client domain. (running on Linux  
xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006 i686 GNU/ 
Linux)

I get the error: "Error: Device 2049 (vbd) could not be connected.  
Backend device not found.
"

Now, I tracked it initially to being that Domain0 doesn''t have /dev/ 
sda*, which the client domains are using as root, so I used MAKEDEV  
to create the device nodes and had some success.

However, if I halt/reboot/shutdown the client domain, the error  
returns if I try to restart it, even though the devices are in  
Domain0''s /dev/

Also, if I reboot the whole machine, sometimes the client domains  
will start and some times they won''t. Again, if they do, I
can''t
restart them without that error occurring.

I get a lot of errors like the following in /var/log/xen-hotplug.log

"
xenstore-read: xenstore-read: couldn''t read path
backend/vbd/1/2049/node
couldn''t read path backend/vbd/1/2050/node
xenstore-read: couldn''t read path backend/vbd/2/2049/node
xenstore-read: couldn''t read path backend/vbd/2/2050/node
xenstore-read: couldn''t read path backend/vbd/3/2050/node
"

My /etc/xen/server.cfg:

kernel = "/boot/xen-linux-2.6.12.6-xen"
memory = 128
name   = "squid1"
root   = "/dev/sda1 ro"
vif    = [""]
disk   = [ ''file:/xen/domains/squid1/disk.img,sda1,w'',
''file:/xen/
domains/squid1/swap.img,sda2,w'' ]
dhcp = "dhcp"

Any ideas chaps?

Thanks!

  -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
124-128 Barlby Road, London W10 6BL
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On 26 Apr 2006, at 13:26, Joe Warren-Meeks wrote:

Hey there,
> I''ve installed xen 3 and xen-tools on my ubuntu server and all  
> seems well, until I try to start a client domain. (running on Linux  
> xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006 i686 GNU/ 
> Linux)
Bit of a follow-up. If I try to start the DomU, it initally errors as  
so:

root@xenserver:/etc/xen# xm create -c squid1.cfg
Using config file "squid1.cfg".
Error: Device 2049 (vbd) could not be connected. Backend device not  
found.

and then shows up as paused in ''xm list''

If I then attach a console to it, then unpause I see the following  
error at the end:

VFS: Cannot open root device "sda1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown- 
block(0,0)

I''ve tried adding /dev/ nodes using MAKEDEV in both the Dom0 and DomU  
and tried changing sda to hda, to no avail.

Anyone got a pointer to where I can start looking?

Cheers

  -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
124-128 Barlby Road, London W10 6BL
PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC



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On 27 Apr 2006, at 14:49, Nicola Bianchi wrote:
> Joe Warren-Meeks wrote:
>> Bit of a follow-up. If I try to start the DomU, it initally errors  
>> as so:
>> root@xenserver:/etc/xen# xm create -c squid1.cfg
>> Using config file "squid1.cfg".
>> Error: Device 2049 (vbd) could not be connected. Backend device  
>> not found.
>
> have you start xend daemon?
> # xend start
Yes, it was running.

It seems to be some interaction between the /dev/sda stuff and the  
scsi module. I just managed to get DomU to boot once by doing a  
modload sd_mod and then un-pausing a stuck boot. But doing it from  
fresh fails.

My xen server is an ide machine (it is a development environment)

Any more pointers?

  -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
124-128 Barlby Road, London W10 6BL
PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC



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On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:

Hey guys,
>> I''ve installed xen 3 and xen-tools on my ubuntu server and all
>> seems well, until I try to start a client domain. (running on  
>> Linux xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006  
>> i686 GNU/Linux)
>
> Bit of a follow-up. If I try to start the DomU, it initally errors  
> as so:
>
> root@xenserver:/etc/xen# xm create -c squid1.cfg
> Using config file "squid1.cfg".
> Error: Device 2049 (vbd) could not be connected. Backend device not  
> found.
>
> and then shows up as paused in ''xm list''
>
> If I then attach a console to it, then unpause I see the following  
> error at the end:
>
> VFS: Cannot open root device "sda1" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown- 
> block(0,0)
>
> I''ve tried adding /dev/ nodes using MAKEDEV in both the Dom0 and  
> DomU and tried changing sda to hda, to no avail.
>
> Anyone got a pointer to where I can start looking?
As a futher follow up, if I use xen-create-image to create a new  
domU, this completes fine and then starts the image successfully! I  
can then go and start all the other images and all is fine.

Once I''ve halted them all and rebooted the server itself, it all  
stops working again.

Anyone got any pointers? This is getting quite frustrating.

  -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
124-128 Barlby Road, London W10 6BL
PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC



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Hi Joe,

Good on ya for keeping it up mate. I have the same problem & have been 
hunting around for an answer. If I learn anything new I will post it 
here. Heres something random for ya:

On my server upgrading from 3.0.1 -> 3.0.2 means that this error shows 
up after i''ve booted 2 DomU''s before it was showing up after
i''d booted
one. All I can say is weird.

Best Regards,

Quintin

Joe Warren-Meeks wrote:
>
> On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:
>
> Hey guys,
>
>>> I''ve installed xen 3 and xen-tools on my ubuntu server and
all seems
>>> well, until I try to start a client domain. (running on Linux 
>>> xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006 i686 
>>> GNU/Linux)
>>
>> Bit of a follow-up. If I try to start the DomU, it initally errors as 
>> so:
>>
>> root@xenserver:/etc/xen# xm create -c squid1.cfg
>> Using config file "squid1.cfg".
>> Error: Device 2049 (vbd) could not be connected. Backend device not 
>> found.
>>
>> and then shows up as paused in ''xm list''
>>
>> If I then attach a console to it, then unpause I see the following 
>> error at the end:
>>
>> VFS: Cannot open root device "sda1" or unknown-block(0,0)
>> Please append a correct "root=" boot option
>> Kernel panic - not syncing: VFS: Unable to mount root fs on 
>> unknown-block(0,0)
>>
>> I''ve tried adding /dev/ nodes using MAKEDEV in both the Dom0
and DomU
>> and tried changing sda to hda, to no avail.
>>
>> Anyone got a pointer to where I can start looking?
>
> As a futher follow up, if I use xen-create-image to create a new domU, 
> this completes fine and then starts the image successfully! I can then 
> go and start all the other images and all is fine.
>
> Once I''ve halted them all and rebooted the server itself, it all
stops
> working again.
>
> Anyone got any pointers? This is getting quite frustrating.
>
>  -- joe.
>
> Joe Warren-Meeks                       T: +44 (0) 208 962 0007
> Aggregator Limited                     M: +44 (0) 7789 176078
> Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
> 124-128 Barlby Road, London W10 6BL
> PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

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Joe Warren-Meeks wrote:
>
> On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:
>
> Hey guys,
>
>>> I''ve installed xen 3 and xen-tools on my ubuntu server and
all seems
>>> well, until I try to start a client domain. (running on Linux
>>> xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006 i686
>>> GNU/Linux)
>>
>>
>> Bit of a follow-up. If I try to start the DomU, it initally errors as
>> so:
>>
>> root@xenserver:/etc/xen# xm create -c squid1.cfg
>> Using config file "squid1.cfg".
>> Error: Device 2049 (vbd) could not be connected. Backend device not
>> found.
>>
>> and then shows up as paused in ''xm list''
>>
>> If I then attach a console to it, then unpause I see the following
>> error at the end:
>>
>> VFS: Cannot open root device "sda1" or unknown-block(0,0)
>> Please append a correct "root=" boot option
>> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-
>> block(0,0)
>>
>> I''ve tried adding /dev/ nodes using MAKEDEV in both the Dom0
and DomU
>> and tried changing sda to hda, to no avail.
>>
>> Anyone got a pointer to where I can start looking?
>
>
> As a futher follow up, if I use xen-create-image to create a new domU,
> this completes fine and then starts the image successfully! I can then
> go and start all the other images and all is fine.
>
> Once I''ve halted them all and rebooted the server itself, it all
stops
> working again.
>
> Anyone got any pointers? This is getting quite frustrating.
>
I''m getting exactly the same error (also using Ubuntu). I just tried
mounting and unmounting the one of the images and that seems to get
everything working - till the next reboot.

mount -o loop /vserver/images/vmNMS.img /vserver/vm_base/
umount /vserver/vm_base/

Any idea why this happens? I''ve also been pulling my hair out the past
couple of days.

Regards,
Abi





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On 28 Apr 2006, at 12:32, Abi Chirayil wrote:
> Joe Warren-Meeks wrote:
>
>>
>> On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:
>>
>> Hey guys,
>>
>>>> I''ve installed xen 3 and xen-tools on my ubuntu server
and all
>>>> seems
>>>> well, until I try to start a client domain. (running on Linux
>>>> xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006 i686
>>>> GNU/Linux)
>>>
>>>
>>> Bit of a follow-up. If I try to start the DomU, it initally  
>>> errors as
>>> so:
>>>
>>> root@xenserver:/etc/xen# xm create -c squid1.cfg
>>> Using config file "squid1.cfg".
>>> Error: Device 2049 (vbd) could not be connected. Backend device not
>>> found.
>>>
>>> and then shows up as paused in ''xm list''
>>>
>>> If I then attach a console to it, then unpause I see the following
>>> error at the end:
>>>
>>> VFS: Cannot open root device "sda1" or unknown-block(0,0)
>>> Please append a correct "root=" boot option
>>> Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-
>>> block(0,0)
>>>
>>> I''ve tried adding /dev/ nodes using MAKEDEV in both the
Dom0 and
>>> DomU
>>> and tried changing sda to hda, to no avail.
>>>
>>> Anyone got a pointer to where I can start looking?
>>
>>
>> As a futher follow up, if I use xen-create-image to create a new  
>> domU,
>> this completes fine and then starts the image successfully! I can  
>> then
>> go and start all the other images and all is fine.
>>
>> Once I''ve halted them all and rebooted the server itself, it
all
>> stops
>> working again.
>>
>> Anyone got any pointers? This is getting quite frustrating.
>>
> I''m getting exactly the same error (also using Ubuntu). I just
tried
> mounting and unmounting the one of the images and that seems to get
> everything working - till the next reboot.
>
> mount -o loop /vserver/images/vmNMS.img /vserver/vm_base/
> umount /vserver/vm_base/
>
> Any idea why this happens? I''ve also been pulling my hair out the
past
> couple of days.
Think I''ve fixed it.

I read xen-create-image to see why it seemed to work if I used that.  
Just by an aside I noticed that there is an option of use-ide

So, I''ve set "use-ide = 1" in /etc/xen-tools/xen-tools.conf
and
recreated my images and it seems to work now.

I figure that an IDE server has problems trying to run a SCSI domU

I''m creating a bunch of domUs now and rebooting to see if they all  
start ok. (I also had to up my loopback devices as indicated in  
another post)

Give it a shot and report back.

  -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
124-128 Barlby Road, London W10 6BL
PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC



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On 28 Apr 2006, at 12:55, Joe Warren-Meeks wrote:

Hey guys,
> I read xen-create-image to see why it seemed to work if I used  
> that. Just by an aside I noticed that there is an option of use-ide
>
> So, I''ve set "use-ide = 1" in
/etc/xen-tools/xen-tools.conf and
> recreated my images and it seems to work now.
>
> I figure that an IDE server has problems trying to run a SCSI domU
>
> I''m creating a bunch of domUs now and rebooting to see if they all
> start ok. (I also had to up my loopback devices as indicated in  
> another post)
>
> Give it a shot and report back.
Just to confirm, changing use-ide = 1 and changing my /etc/init.d/ 
xend to read:

   start)
         modprobe loop max_loop=64
         cd /dev && /dev/MAKEDEV loop
         xend start
         await_daemons_up
         ;;

fixed my problems. I now have three domU''s working happily.

Good luck.

  -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
124-128 Barlby Road, London W10 6BL
PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC



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Joe Warren-Meeks wrote:
>
> On 28 Apr 2006, at 12:32, Abi Chirayil wrote:
>
>> Joe Warren-Meeks wrote:
>>
>>>
>>> On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:
>>>
>>> Hey guys,
>>>
>>>>> I''ve installed xen 3 and xen-tools on my ubuntu
server and all  seems
>>>>> well, until I try to start a client domain. (running on
Linux
>>>>> xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC 2006
i686
>>>>> GNU/Linux)
>>>>
>>>>
>>>>
>>>> Bit of a follow-up. If I try to start the DomU, it initally 
errors as
>>>> so:
>>>>
>>>> root@xenserver:/etc/xen# xm create -c squid1.cfg
>>>> Using config file "squid1.cfg".
>>>> Error: Device 2049 (vbd) could not be connected. Backend device
not
>>>> found.
>>>>
>>>> and then shows up as paused in ''xm list''
>>>>
>>>> If I then attach a console to it, then unpause I see the
following
>>>> error at the end:
>>>>
>>>> VFS: Cannot open root device "sda1" or
unknown-block(0,0)
>>>> Please append a correct "root=" boot option
>>>> Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-
>>>> block(0,0)
>>>>
>>>> I''ve tried adding /dev/ nodes using MAKEDEV in both
the Dom0 and  DomU
>>>> and tried changing sda to hda, to no avail.
>>>>
>>>> Anyone got a pointer to where I can start looking?
>>>
>>>
>>>
>>> As a futher follow up, if I use xen-create-image to create a new 
domU,
>>> this completes fine and then starts the image successfully! I can 
then
>>> go and start all the other images and all is fine.
>>>
>>> Once I''ve halted them all and rebooted the server itself,
it all  stops
>>> working again.
>>>
>>> Anyone got any pointers? This is getting quite frustrating.
>>>
>> I''m getting exactly the same error (also using Ubuntu). I just
tried
>> mounting and unmounting the one of the images and that seems to get
>> everything working - till the next reboot.
>>
>> mount -o loop /vserver/images/vmNMS.img /vserver/vm_base/
>> umount /vserver/vm_base/
>>
>> Any idea why this happens? I''ve also been pulling my hair out
the past
>> couple of days.
>
>
> Think I''ve fixed it.
>
> I read xen-create-image to see why it seemed to work if I used that.  
> Just by an aside I noticed that there is an option of use-ide
>
> So, I''ve set "use-ide = 1" in
/etc/xen-tools/xen-tools.conf and
> recreated my images and it seems to work now.
I don''t have these files and options under FC5, are you under Debian?

Is there another place where I can specify the use-ide=1 option as I 
have the exact same problem that this solution seems to solve.

Regards,
>
> I figure that an IDE server has problems trying to run a SCSI domU
>
> I''m creating a bunch of domUs now and rebooting to see if they all
> start ok. (I also had to up my loopback devices as indicated in  
> another post)
>
> Give it a shot and report back.
>
>  -- joe.
>
> Joe Warren-Meeks                       T: +44 (0) 208 962 0007
> Aggregator Limited                     M: +44 (0) 7789 176078
> Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@aggregator.tv
> 124-128 Barlby Road, London W10 6BL
> PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users


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Etienne Duguay wrote:
> Joe Warren-Meeks wrote:
>
>>
>> On 28 Apr 2006, at 12:32, Abi Chirayil wrote:
>>
>>> Joe Warren-Meeks wrote:
>>>
>>>>
>>>> On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:
>>>>
>>>> Hey guys,
>>>>
>>>>>> I''ve installed xen 3 and xen-tools on my
ubuntu server and all
>>>>>> seems
>>>>>> well, until I try to start a client domain. (running on
Linux
>>>>>> xenserver 2.6.12.6-xen #1 SMP Wed Feb 1 21:23:17 UTC
2006 i686
>>>>>> GNU/Linux)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Bit of a follow-up. If I try to start the DomU, it initally
>>>>> errors as
>>>>> so:
>>>>>
>>>>> root@xenserver:/etc/xen# xm create -c squid1.cfg
>>>>> Using config file "squid1.cfg".
>>>>> Error: Device 2049 (vbd) could not be connected. Backend
device not
>>>>> found.
>>>>>
>>>>> and then shows up as paused in ''xm list''
>>>>>
>>>>> If I then attach a console to it, then unpause I see the
following
>>>>> error at the end:
>>>>>
>>>>> VFS: Cannot open root device "sda1" or
unknown-block(0,0)
>>>>> Please append a correct "root=" boot option
>>>>> Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-
>>>>> block(0,0)
>>>>>
>>>>> I''ve tried adding /dev/ nodes using MAKEDEV in
both the Dom0 and
>>>>> DomU
>>>>> and tried changing sda to hda, to no avail.
>>>>>
>>>>> Anyone got a pointer to where I can start looking?
>>>>
>>>>
>>>>
>>>>
>>>> As a futher follow up, if I use xen-create-image to create a
new
>>>> domU,
>>>> this completes fine and then starts the image successfully! I
can
>>>> then
>>>> go and start all the other images and all is fine.
>>>>
>>>> Once I''ve halted them all and rebooted the server
itself, it all
>>>> stops
>>>> working again.
>>>>
>>>> Anyone got any pointers? This is getting quite frustrating.
>>>>
>>> I''m getting exactly the same error (also using Ubuntu). I
just tried
>>> mounting and unmounting the one of the images and that seems to get
>>> everything working - till the next reboot.
>>>
>>> mount -o loop /vserver/images/vmNMS.img /vserver/vm_base/
>>> umount /vserver/vm_base/
>>>
>>> Any idea why this happens? I''ve also been pulling my hair
out the past
>>> couple of days.
>>
>>
>>
>> Think I''ve fixed it.
>>
>> I read xen-create-image to see why it seemed to work if I used that.  
>> Just by an aside I noticed that there is an option of use-ide
>>
>> So, I''ve set "use-ide = 1" in
/etc/xen-tools/xen-tools.conf and
>> recreated my images and it seems to work now.
>
>
> I don''t have these files and options under FC5, are you under
Debian?
>
> Is there another place where I can specify the use-ide=1 option as I 
> have the exact same problem that this solution seems to solve.
>
> Regards,
>
Ok,

For this one I''ve added the domU kernel the ramdisk instruction in the 
domU config. In FC5 you need both.

For the network problem I had to specify the number of nics:

kernel = "/boot/vmlinuz-2.6.16-1.2096_FC5xenU"
memory = 128
name = "centos-HSPERE"
ramdisk = "/boot/initrd-2.6.16-1.2096_FC5xenU.img"
vif = [ '''' ]
nics = 1
#dhcp = "dhcp"
disk = 
[''file:/img/centos.4-2.VSI,sda1,w'',''file:/img/centos.swap,sda2,w'',''file:/img/tmpfiles,sda3,w'']
root = "/dev/sda1 ro"
>>
>> I figure that an IDE server has problems trying to run a SCSI domU
>>
>> I''m creating a bunch of domUs now and rebooting to see if they
all
>> start ok. (I also had to up my loopback devices as indicated in  
>> another post)
>>
>> Give it a shot and report back.
>>
>>  -- joe.
>>
>> Joe Warren-Meeks                       T: +44 (0) 208 962 0007
>> Aggregator Limited                     M: +44 (0) 7789 176078
>> Unit 62/63 Pall Mall Deposit           E:
joe.warren-meeks@aggregator.tv
>> 124-128 Barlby Road, London W10 6BL
>> PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC
>>
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>
>
>
>

-- 
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Virtual Space International INC.,
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       -Benjamin Franklin
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 but only to give moral cowards an excuse not to think at all."
       - Michael Rivero
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including its licensing of a monopolistic central bank, 
reduces all men''s freedom and most men''s wealth"
       -Ludwig von Mises
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doing all right"
	-Unknown


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