On 03/16/2011 04:51 AM, Kirby Zhou wrote:
Does RHEL6 KVM PXE actually work?
Your example shows a bridge involved. You may be impacted by the
default 15 second bridge forwarding timeout.
By by default, it takes the bridge 15 seconds to accept packets on a
newly joined interface. This is a spanning tree issue.
You can check the value with brctl:
/usr/sbin/brctl showstp ${DEVICE}
You set it with brctl like this:
/usr/sbin/brctl setfd ${DEVICE} ${DELAY}
However, it is much more convenient to set it on the ifcfg-brN
Simply add a DELAY parameter to the br0 definition.
You can see the example on the libvirt wiki page, although they do not
explain it there.
http://wiki.libvirt.org/page/Networking
It took us a while to find it, because the VMs start quicker on RHEL-6.
On RHEL-5 based KVMs, we always noticed how long the PXE boot took, but
it did eventually start. That is because it took 5 seconds longer to
get to that point.
When we did find it, and correct it on both new and old servers, the
RHEL-5 based VMs PXE booted immediately as well.
Good Luck!
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