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
http://fedoraproject.org/wiki/End_of_life
> 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.
Regards,
Fajar
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