Mailing List Archive: 10th Domain Error

10th Domain Error

Jun 17, 2005, 3:39 PM

Post #1 of 3 (389 views)

All,

I'm trying to see how many Xen domains I can create at one time. When I
attempt to create my 10th domain I get the error:

Error: Error creating domain: vbd: Segment not found:
uname=file:/root/xen/run/vnode29_deb3.1_1.img

Even though it's clearly there:

#ll /root/xen/run/vnode29_deb3.1_1.img
-rw-r--r-- 1 root root 104857600 Jun 17
14:29 /root/xen/run/vnode29_deb3.1_1.img

Has anyone seen this before?

-Michael

###########Setup###########

FC4 System
Dom0 Kernel: 2.6.11-1.1369_FC4xen0
DomU Kernel: vmlinuz-2.6.11-1.1369_FC4xenU

xm list:
Name Id Mem(MB) CPU State Time(s) Console
Domain-0 0 123 0 r---- 100.1
vnode20 1 63 0 -b--- 27.3 9601
vnode21 2 63 0 -b--- 26.8 9602
vnode22 3 63 0 -b--- 26.3 9603
vnode23 4 63 0 -b--- 26.0 9604
vnode24 5 63 0 -b--- 25.6 9605
vnode25 6 63 0 -b--- 25.4 9606
vnode26 7 63 0 -b--- 25.3 9607
vnode27 8 63 0 -b--- 24.8 9608

Domain Creation command:
xm create name="vnode29" kernel="/boot/vmlinuz-2.6.11-1.1369_FC4xenU"
memory=64 disk='file:/root/xen/run/vnode29_deb3.1_1.img,sda1,w'
root="/dev/sda1 rw" restart="onreboot" extra="VNODEIP=10.10.10.29
SERVERIP=10.10.10.20 NODELIST= DOMNAME=vnode29 GATEWAY=10.10.10.99
DNS=205.118.70.2"

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Re: 10th Domain Error [ In reply to ]

mark.williamson at cl

Jun 17, 2005, 3:38 PM

Post #2 of 3 (375 views)

Permalink

You've run out of loop devices: there's some kernel parameter for fixing this
(you'll probably be able to find it in the mailing archives). I think it's
maxloop=n

You also need to create new loop[n] device nodes in /dev.

Cheers,
Mark

On Friday 17 June 2005 23:39, Michael Musson wrote:
> All,
>
> I'm trying to see how many Xen domains I can create at one time. When I
> attempt to create my 10th domain I get the error:
>
> Error: Error creating domain: vbd: Segment not found:
> uname=file:/root/xen/run/vnode29_deb3.1_1.img
>
> Even though it's clearly there:
>
> #ll /root/xen/run/vnode29_deb3.1_1.img
> -rw-r--r-- 1 root root 104857600 Jun 17
> 14:29 /root/xen/run/vnode29_deb3.1_1.img
>
> Has anyone seen this before?
>
> -Michael
>
>
> ###########Setup###########
>
> FC4 System
> Dom0 Kernel: 2.6.11-1.1369_FC4xen0
> DomU Kernel: vmlinuz-2.6.11-1.1369_FC4xenU
>
> xm list:
> Name Id Mem(MB) CPU State Time(s) Console
> Domain-0 0 123 0 r---- 100.1
> vnode20 1 63 0 -b--- 27.3 9601
> vnode21 2 63 0 -b--- 26.8 9602
> vnode22 3 63 0 -b--- 26.3 9603
> vnode23 4 63 0 -b--- 26.0 9604
> vnode24 5 63 0 -b--- 25.6 9605
> vnode25 6 63 0 -b--- 25.4 9606
> vnode26 7 63 0 -b--- 25.3 9607
> vnode27 8 63 0 -b--- 24.8 9608
>
> Domain Creation command:
> xm create name="vnode29" kernel="/boot/vmlinuz-2.6.11-1.1369_FC4xenU"
> memory=64 disk='file:/root/xen/run/vnode29_deb3.1_1.img,sda1,w'
> root="/dev/sda1 rw" restart="onreboot" extra="VNODEIP=10.10.10.29
> SERVERIP=10.10.10.20 NODELIST= DOMNAME=vnode29 GATEWAY=10.10.10.99
> DNS=205.118.70.2"
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

_______________________________________________
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Re: 10th Domain Error [ In reply to ]

davidh.davidh at gmail

Jun 17, 2005, 3:49 PM

Post #3 of 3 (365 views)

Permalink

The Wiki "http://wiki.xensource.com/xenwiki" has useful information
like the following... :)

http://wiki.xensource.com/xenwiki/XenFaq#head-b4167b873a6b3a6657ecf9339c44e4a0692f8ada

4.4. When I start a 9th domain using a loop-back file as its virtual
disk why do I get "Error: vbd: Segment not found:
uname=file:/path/to/image"?

By default, Linux only allows up to 8 loop-back devices to be active.
You can increase this number by setting max_loop=32 (etc) on the
domain 0 kernel command line in Grub.

On 6/17/05, Michael Musson <musson@clusterresources.com> wrote:
> All,
>
> I'm trying to see how many Xen domains I can create at one time. When I
> attempt to create my 10th domain I get the error:
>
> Error: Error creating domain: vbd: Segment not found:
> uname=file:/root/xen/run/vnode29_deb3.1_1.img
>
> Even though it's clearly there:
>
> #ll /root/xen/run/vnode29_deb3.1_1.img
> -rw-r--r-- 1 root root 104857600 Jun 17
> 14:29 /root/xen/run/vnode29_deb3.1_1.img
>
> Has anyone seen this before?
>
> -Michael
>
>
> ###########Setup###########
>
> FC4 System
> Dom0 Kernel: 2.6.11-1.1369_FC4xen0
> DomU Kernel: vmlinuz-2.6.11-1.1369_FC4xenU
>
> xm list:
> Name Id Mem(MB) CPU State Time(s) Console
> Domain-0 0 123 0 r---- 100.1
> vnode20 1 63 0 -b--- 27.3 9601
> vnode21 2 63 0 -b--- 26.8 9602
> vnode22 3 63 0 -b--- 26.3 9603
> vnode23 4 63 0 -b--- 26.0 9604
> vnode24 5 63 0 -b--- 25.6 9605
> vnode25 6 63 0 -b--- 25.4 9606
> vnode26 7 63 0 -b--- 25.3 9607
> vnode27 8 63 0 -b--- 24.8 9608
>
> Domain Creation command:
> xm create name="vnode29" kernel="/boot/vmlinuz-2.6.11-1.1369_FC4xenU"
> memory=64 disk='file:/root/xen/run/vnode29_deb3.1_1.img,sda1,w'
> root="/dev/sda1 rw" restart="onreboot" extra="VNODEIP=10.10.10.29
> SERVERIP=10.10.10.20 NODELIST= DOMNAME=vnode29 GATEWAY=10.10.10.99
> DNS=205.118.70.2"
>
>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
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