[Xen-users] XCP gotchas crop up again ....

[Vern Burke <vburke@xxxxxxxx>]

I don't know how I keep running into these things ...... :)

It appears that when a physical Ethernet port is attached to XCP as a 
PIF and then the hardware is changed, XCP will override the current 
hardware's MAC address in favor of the original MAC address.
I discovered this the hard way. Some time back, I had the hard drive in 
the pool master pack up on me. When I replaced and rebuilt the drive, I 
also built a preloaded a second spare drive from the same machine so it 
would be quicker to recover a failed drive.
Yesterday I loaded the spare in a new machine, fired it up, changed the 
network IP addresses and host name, dropped it into the middle of my 
running cloud, and immediately caused a MAC conflict with the pool 
master (the results were NOT pretty). I finally managed to spot the 
problem by comparing the Linux ifconfig results to xsconsole's display 
NICs result and noting the non-matching MACs.
End result is that you must (as far as I can tell) use pif-forget and 
pif-introduce to remove and add back the Ethernet ports to XCP when 
changing hardware to get XCP to respect the new MAC.
Vern


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