[one-users] "Inappropriate ioctl for device"

[Claude Noshpitz]

Hello,

I've started to see launch failures recently, as my VM hosts are getting more loaded, that generate oned.log messages like this:

Mon Mar 15 15:34:13 2010 [VMM][D]: Message received: LOG - 249 error: internal error Failed to add tap interface 'vnet%d' to bridge 'br0' : Inappropriate ioctl for device

Likely I am missing some documented limitation on the KVM/libvirt or networking side, but it doesn't seem like a hard limit
on VMs per host (at least, the failures seem to happen with e.g. 5, 6, 7, or 8 VMs on a host).

Ideas?  RTFMs?

Thanks!

--Claude