I did migrate my 2 servers, and had quite a bad surprise. Corosync was failing after less than 5 minutes. After many hours of investigation, I did discover that the Procurve 1800-24G switch was the cause of the problem. A multicast test using asmping did show 25% packet loss in multicast. Those 2 servers have never been unsynced with Debian Squeeze / Proxmox 2.x. Moved on a 1810-24G, and it the problem is magically gone.
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