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It seems to me that some device may be accessing the same IP address that Proxmox has. If this happens, start examining the ARP table to see if the MAC address from this table matches the Proxmox host address. If possible, show your network configuration from the /etc/network/interfaces file

If I had the option of putting in just one SSD, I would do it as a cache and not think too much about it. I don't see any particular disadvantages of this solution.

If you RAID is on zfs zpool, you can add disk cache z your zpool zpool add your pool cache /dev/sdxxxx add/remove vdev cache is non destructive

In my tests, it turned out that a disabled machine migrates much faster. If you can afford to disable the VM, try this method.

In Windows Pro or Windows server, do you have hyper-v, good hypervisor. Try this if you want Windows evirnoment.

qm migrate VMxxx nodexxx --migration_type insecure nvme-eui.36434b305750039700200000001-part1 ONLINE 0 0 0 is the same disk as SAMSUNG_MZQL27T6HBLA ?

high memory and cpu utilization. Do you have deduplication on? zfs get dedup show yor pool configuration, source and destination zpool status

Yes, it is possible, but there are some limitations. If your pool is mirror add mirror, if raidz1 add raidz1 Example. You have pool zpoolxxx mirror-0 /dev/sda /dev/sdb Add bigger disks to pool zpool add zpoolxxx mirror /dev/sdc /dev/sdd next zpool remove zpoolxxx mirror-0

Look at this, how to configure aliases in Debian https://wiki.debian.org/NetworkConfiguration#Multiple_IP_addresses_on_one_Interface

Network cable id DOWN and your setup is Can you connect proxmox to the router via cable?

You connect to router throught WiFi or network cable?

VM configuration is saved in the file /etc/pve/nodes/node_name/qemu-server/xxx.conf file move this file on working node from /etc/pve/nodes/death_node/qemu-server/xxx.conf to working node. or change expected votes pvecm expected xxxx and qm migrate xxx nodexxx

no, your router has 24 bit mask

Ok This command show your real interfaces and IP addresses ip a interface name uses in /etc/network/interfaces cat /etc/network/interfaces when you show your /etc/network/interfaces is mishmash iface episo inet manual auto umbro iface unbro inet dhcp address 192.168.0.50 gateway 192.168.0.1...

maybe this o not 0 enpso not enpis0 if you set dhcp remove line address and gateway from /etc/network/interfaces check what is real interface name ip a

show us your files /etc/network/interfaces and /etc/hosts

It is your configuration. You have loop on layer2 Schema network Solution is spanning tree or other to detect loop.

You set static IP 192.168.20.12 address when you install Proxmox. You have to change from console. Change in file /etc/network/interfaces and /etc/hosts

Hardware problem? Link directly proxmox and test computer. Set on this computer addres 192.168.1.xxx/24 and try ping both directions.

Looks good. Try to ping your gateway from proxmox to 192.168.1.1 Firewall disable on cluster in file /etc/pve/firewall/cluster.fw firewall disable on host/node in file /etc/pve/nodes/your_node_name/host.fw