Re: [Xen-users] Backend device not found

[Fasiha Ashraf <feehapk@xxxxxxxxxxx>]

Hi there,
1- I am  unable to find that "/etc/modprobe.conf" file where I can add "options loop max_loop= 256". Remember i am using Debian 4.0 (etch).
2- There is another problem that we are facing here. We have created 6 VMs but only 4 can run in parallel . Whenever we start the 5th VM the same error occurs "Backend Device not found"
when I checked the loop inside dev
debian:/dev# cd loop <tab>
loop/  loop0  loop1  loop2  loop3  loop4  loop5  loop6  loop7
and
debian:/dev# cd loop
debian:/dev/loop# ls
0
debian:/dev/loop#

How can I check the status of loops or how I come to know that which VM is using which Loop?
Regards

Fasiha Ashraf

--- On Sat, 20/6/09, Andreas Sommer <AndiDog@xxxxxx> wrote:

From: Andreas Sommer <AndiDog@xxxxxx>
Subject: Re: [Xen-users] Backend device not found
To: "Fasiha Ashraf" <feehapk@xxxxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Date: Saturday, 20 June, 2009, 7:50 PM

Hi,

I see "Failed to find an unused loop device" in the output you posted.
Correct that first (e.g. using the description at
http://lists.xensource.com/archives/html/xen-users/2006-06/msg01148.html).

Cheers
Andreas

Fasiha Ashraf wrote:
>
>
>
>      xenbr0: port 7(vif8.0) entering disabled state
>     Jun 20 02:21:11 localhost logger: /etc/xen/scripts/vif-bridge:
>     offline XENBUS_PATH=backend/vif/8/0
>     Jun 20 02:21:11 localhost kernel: device vif8.0 left promiscuous mode
>     Jun 20 02:21:11 localhost kernel: audit(1245478871.070:15):
>     dev=vif8.0 prom=0 old_prom=256 auid=4294967295
>     Jun 20 02:21:11 localhost kernel: xenbr0: port 7(vif8.0) entering
>     disabled state
>     Jun 20 02:21:11 localhost logger: /etc/xen/scripts/vif-bridge:
>     brctl delif xenbr0 vif8.0 failed
>     Jun 20 02:21:11 localhost logger: /etc/xen/scripts/vif-bridge:
>     ifconfig vif8.0 down failed
>     Jun 20 02:21:11 localhost logger: /etc/xen/scripts/vif-bridge:
>     Successful vif-bridge offline for vif8.0, bridge xenbr0.
>     Jun 20 02:21:11 localhost logger:
>     /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vif/8/0
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block: Forced
>     to steal lock on /var/run/xen-hotplug/block from 22545:
>     /etc/xen/scripts/block!
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block: Writing
>     backend/vbd/7/2050/hotplug-status error to xenstore.
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block: Failed
>     to find an unused loop device
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block: remove
>     XENBUS_PATH=backend/vbd/7/2050
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block: Writing
>     backend/vbd/7/2050/hotplug-status error to xenstore.
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block:
>     xenstore-read backend/vbd/7/2050/node failed.
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block: Writing
>     backend/vbd/7/2050/hotplug-status error to xenstore.
>     Jun 20 02:21:17 localhost logger: /etc/xen/scripts/block:
>     /etc/xen/scripts/block failed; error detected.
>     Jun 20 02:21:17 localhost logger:
>     /etc/xen/scripts/xen-hotplug-cleanup: XENBUS_PATH=backend/vbd/7/2050
>     Jun 20 02:21:18 localhost logger:
>     /etc/xen/scripts/xen-hotplug-cleanup: Forced to steal lock on
>     /var/run/xen-hotplug/block from 22561: /etc/xen/scripts/bloc$
>     Jun 20 02:21:18 localhost logger:
>     /etc/xen/scripts/xen-hotplug-cleanup: Forced to steal lock on
>     /var/run/xen-hotplug/block from unknown!
>     Jun 20 02:21:18 localhost logger: /etc/xen/scripts/block: Writing
>     backend/vbd/8/2050/hotplug-status error to xenstore.
>     Jun 20 02:21:18 localhost logger: /etc/xen/scripts/block: Failed
>     to find an unused loop device
>     Jun 20 02:21:18 localhost logger: /etc/xen/scripts/block: remove
>     XENBUS_PATH=backend/vbd/8/2050
>     Jun 20 02:21:18 localhost logger: /etc/xen/scripts/block: Writing
>     backend/vbd/8/2050/hotplug-status error to xenstore.
>     Jun 20 02:21:18 localhost logger: /etc/xen/scripts/block:
>     xenstore-read backend/vbd/8/2050/node failed.
>
>     Anybody face this issue before? What could be the solution?
>     Regards
>     Fasiha Ashraf
>
>
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