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How to do snapshot on proxmox ? Backup and restore

Hello, Thanks for the links it looks helpful. Just one question, i've already removed acpid with: aptitude remove acpid, i have even setted 'PWR-Fail’ settings in the BIOS. Does it effect HA ? becuz it got watchdog fencing

You don't have access to proxmox web interface in both nodes, you mean ? if so, try this command : pvecm updatecerts --force. for quorum i had the same issue it takes servel minutes sometimes. if you can access to ssh and get return from ping, what does pvecm n and pvecm n show ?

I'm using Proxmox 4.0, i have three nodes and i want to run High Avaibility. To do so i need to configure Fencing but i couldnt find "/etc/default/redhat-cluster-pve" Can anyone give me a good tutorial to run HA ? is it ok to run HA now with3 nodes and then add other nodes ?

Yes, i added the second one. Thanks for the information, i didn't know that the file has been replaced. I am using Proxmox 4. and after testing Omping multicast is not enabled, have you an idea how can i enable it ?

I tried many time with differents machines to create a cluster but after entring the command the result is weird, quite different than in tutorials (it doesnt do it propply). Many files are missing as well, such as : "/pve/cluster.conf" "authorized_keys" "no CMAN". Any ideas of what's going on...