[Xen-bugs] [Bug 743] Unable to start more than a few domU's on RHEL4 amd64 (Error: Backend device not found)

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=743





------- Comment #11 from tejasvia@xxxxxxxxx  2006-08-28 20:27 -------
Hi Andrew:

It is the correct kernel - unstable (based on 2.6.16.13 in my download)

<tejasvia@compute-5-24>
$ zcat /proc/config.gz | egrep "POLL|BLKDEV"
CONFIG_EPOLL=y
CONFIG_NETPOLL=y
# CONFIG_NETPOLL_RX is not set
CONFIG_NETPOLL_TRAP=y
CONFIG_NET_POLL_CONTROLLER=y
CONFIG_EDAC_POLL=y
CONFIG_XEN_BLKDEV_BACKEND=y
CONFIG_XEN_BLKDEV_TAP=y
CONFIG_XEN_BLKDEV_FRONTEND=y

<tejasvia@compute-5-24>
$ uname -a                                                                      
Linux compute-5-24.palab.panasas.com 2.6.16.13-xen #2 SMP Mon Aug 28 15:19:51
EDT 2006 x86_64 x86_64 x86_64 GNU/Linux  


I start the VM's sequentially using xm create
# xm create -c <config_file>

Infact, realising that some race might be the cause for the problems, I even
waited for each domU to boot up completely before trying to start another one.

A sample config file looks as follows:
kernel="/usr0/VM/vmlinuz-2.6.16.13-xen"                                         
memory=25                                                                       
vcpus=2                                                                         
name="vm1"                                                                      
vif=[ '' ]                                                                      
dhcp="dhcp"                                                                     
disk=['tap:aio:/usr0/VM/vm1/vm1-fs.img,hda1,w',
'tap:aio:/usr0/VM/vm1/vm1-swap.img,hda2,w', 'tap:aio:/usr0/VM/nonw.img,hda3,r'] 
root="/dev/hda1"
extra="ro selinux=0 3"

The disk image, nonw.img is intended to be shared between the VM's, though
using different VBD's.

I am recompiling everything now, hoping it is a misconfiguration on my part
that is causing the problem.


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