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I don't know anyone who has good things to say about software RAID

please show us the error or at least describe it more.

When you add and remove nodes from the cluster, you damage the configuration. I would start over again to be safe, and make sure the nodes have the same system time.

500 is a webpage error. You only have 2 proxmox nodes? you need at least 3 to create a stable quorum. Check to make sure the 2 nodes have the same system time.

All 3 of your servers should be in one Proxmox Cluster. That makes all 3 of them redundant. Each node only gets one vote, and a quorum is established with 2 or more active members. There is no reason to give one server more votes than the others, just make a HA group to make sure the VMs are...

It looks like corosync is timing out. Is your network wide open? If there is a firewall blocking all segments to/from port 5405 upstream, you could have this issue. Also, verify that multicast is supported on your switch.

yes. Are you using local or shared storage for your VMs? All you need to do is copy the .raw disk image into the vm's storage directory, like /etc/pve/qemu-server/images/102/disk.raw.

All of those problems sound like connectivity issues. There is an issue with your network.

VIRTio is synthetic adapter, much faster than software designed to behave like hardware.

What is the point of having backups? In this scenario, you want to automatically delete your ONLY backup?

Let us know how it goes. I have had nothing but bugs with the software RAID.

1.) its ok because eth0 is slave for vmbr0. 2.) no you did it wrong. All you need to do is install proxmox again, and configure the network during install. When you reboot, the settings are automatically applied to vmbr0, not eth0. vmbr0 is automatically used as the primary network interface...

Will changing the MTU of the cluster VLAN to 9000 affect the networking stack? We changed it to 9000 for the SAN, but I am concerned it will cause conflicts with vmbr and tap virtual interfaces. The cluster is on the same VLAN as the NFS SAN. Is there any way to have the cluster VLAN and NFS...

Does anyone know what I should set the NFS v3 dataset record size to on Proxmox? Also, where would I configure this setting? I know that VMware's hypervisor requests data using 64k blocks, but what is the kvm/qemu default, and is it possible to alter these settings? I found some old...

Just save your VM disk image in a safe place and re-image both servers. Then create the cluster again, and rebuild VMs using their existing disk images.

Why wouldnt you just use the backup system included in proxmox?

I think with NFSv4 you can disable authentication entirely by specifying "no_root_squash,no_all_squash".

this is an epic question. why is it a bad thing to have VMs talking to each other? i dont really see what you are going for. maybe clarify?

Do you have network traffic alert logs and other asset logs available for review? Have you restarted proxmox host yet?

Oh. I only have this problem with GUI VMs. Maybe try to install QEMU-agent on the VM?