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Re: [Xen-users] problem in xen guest

To: Naveed Iqbal <naveed00786@xxxxxxxxxxx>
Subject: Re: [Xen-users] problem in xen guest
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Mon, 16 Feb 2009 16:16:02 +0700
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On Mon, Feb 16, 2009 at 3:12 PM, Naveed Iqbal <naveed00786@xxxxxxxxxxx> wrote:
> How many xen guest can run parallel?we have Fedora core 8 host(dom0) and 9

Fedora 8 is unsupported. You'd be better of with Centos 5.2

> Fedora caore 8 xen guest(domU) but only 8 guest run parallel when we try to
> run 9th guest then error comes which is
>  return self.xd.domain_start(self.dom.getName(), paused)
>   File "/usr/lib/python2.5/site-packages/xen/xend/XendDomain.py", line 999,
> in domain_start
>     dominfo.waitForDevices()
>   File "/usr/lib/python2.5/site-packages/xen/xend/XendDomainInfo.py", line
> 546, in waitForDevices
>     self.getDeviceController(devclass).waitForDevices()
>   File "/usr/lib/python2.5/site-packages/xen/xend/server/DevController.py",
> line 149, in waitForDevices
>     return map(self.waitForDevice, self.deviceIDs())
>   File "/usr/lib/python2.5/site-packages/xen/xend/server/DevController.py",
> line 174, in waitForDevice
>     "%s" % (devid, self.deviceClass, err))
> VmError: Device 51712 (vbd) could not be connected. Failed to find an unused
> loop device
> so how many xen guest(domU) can run parallel?There is any limitations?

You're hitting loop device limit, not Xen limit.
You can try :
- changing file: to tap:aio: on domU config line (works on Centos at least), or
- add "options loop max_loop=256" to /etc/modprobe.conf, and reboot
your server, or
- switch to LVM or partition-backed storage for domU backend.



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