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

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

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





------- Comment #14 from andrew.warfield@xxxxxxxxxxxx  2006-08-28 21:53 -------
Subject: Re:  Unable to start more than a few domU's on RHEL4 amd64 (Error:
Backend device not found)

Thanks for the extra information.  One more clarification:  Are you
seeing any VMs come up at all?  I expect that error to be a
no-starter, if you are seeing poll() fail then you shouldn't be able
to start any VMs on the blktap.  Rereading you rearlier post though it
sounds like this doesn't happen until you've started a few VMs.

a.

On 8/28/06, bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
<bugzilla-daemon@xxxxxxxxxxxxxxxxxxx> wrote:
> 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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