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and what performance do you expect from single sata disk and qcow2? Did you even read wiki howtos???... http://pve.proxmox.com/wiki/Performance_Tweaks If you want some performance go for hw raid 10 with at least 10000 rpm or try ssd.

unfortunatelly there is no "minimal or NO" downtime in your setup. I also have 4 node setup running on 2.3v. and Im not hurry to update as this will by pain in the a.s and so far cluster running without problems so I will wait. Recomended scenario is make complete backup and start clear...

# smtp example iptables -t nat -A PREROUTING -i $isp -p tcp -d $isp_IP --dport 25 -j DNAT --to yourIP:25 iptables -A FORWARD -i $isp -o $lan -p tcp -d yourIP --dport 25 -j ACCEPT

Well, I did more testing and it looks like something wrong with one of nics on board. I didnt use this one before proxmox install, so this would be the real source of my problem, no cluster setup. Anyway thx.

Hi, I just trying to setup 4 nodes cluster(meantime without HA), which was not problem after reading wiki. I want ask about nodes synchronisation which creates big amount of traffics on our network infrastructure. I definitely dont expect such a multicast storm as its lead to sucessfully DOS...