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Seems like ZFS RAID10 performance is very poor... I wonder the results of linux mdadm RAID10 F2 with this setup, any disadvantages?

Let's go ;)

Best config for your setup is linux mdadm RAID10 F2. Capacity: 2x drives, Read 3x drives, Write: 2x drives, plus you can loose 1 drive and you're still online. There are also RAID10 F3: Capacity: 1,5x drives, Read 3x drives, Write: 1x drives, plus you can loose 2 drives and you're still online...

Better performance for sure plus interchangeability. In case of Hardware RAID if you have some issue with the raid card you need another raid card of the same type to get back your data. With linux mdadm raid you just need some SATA/SAS connectors (direct on motherboard or another generic HBA...

Try to change the CPU VM to Opteron_G3

Best configuration: Disable RAID hardware and expose direct the HDDs to the linux system (HBA mode) and make a RAID10 F2 with mdadm. You will get: Capacity 2x 1.92TB, Read Speed 4x drives, Write Speed 2x drives plus you can loose 2 drives and you're still online.

Better RAID10 F2 than RAID1. @ledahosn: just add a 4th partition in sdc: fdisk /dev/sdc n p 4 w and Add it in Datacenter > Storage.

I didn't get the motivation to disable swap...

If you have CPU usage at 60% inside the VM you have to check the process that are using the CPU inside the VM in Task Manager > Details, order by CPU%, that's not a Proxmox issue.

Your lspci is the same of this one?

Ah ok, what's your Host CPU and motherboard?

Can you post the VM config? qm config Your_VM_ID

You can check the real RAM usage of the machine by webui:

Inside the VM CPU is always at 19%? It is almost the capacity of 1 core. Can you check the details tab, order by CPU% and look if there an application at 18-19%?

Are you sure these flags are supported by your Host CPU? flags=+hv-evmcs;+aes Inside the VM the CPU is 0% while you saw 60% from the proxmox web ui?

Have you tried to disable Spice in the VM config and check the performance?

Nope, something else happened, try to investigate the logs during the time the web ui wasn't accessible. Glad to help you! Hit like button on my post, will be appreciated :)

Just deleting ISO didn't broke Proxmox web gui. Anyway just for the VM you can delete the line with the ISO by editing the VM config file, for example: nano /etc/pve/qemu-server/100.conf Than you can boot the VM.

resize2fs /dev/mapper/pve-root This command extend the ext4 filesystem of root partition.

Where you see this? can you post a screenshot?