VMs on a 512 GB Proxmox Host
After reserving memory for Proxmox, ZFS and 10% headroom, a 512 GB host fits about 110 VMs of 4 GB. Add your CPU and storage below.
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The Host
One VM
CPU Overcommit
Disk Overcommit
Fill in the host and one VM to see how many fit.
Proxmox Resource Calculator
VMs that fit in 512 GB of RAM
1 GB VMs440
2 GB VMs220
4 GB VMs110
8 GB VMs55
16 GB VMs27
Reserved4 GB Proxmox, 16 GB ZFS ARC, 10% headroom
RAM is counted 1:1 because it does not overcommit safely on KVM. CPU usually does (3 to 4 vCPUs per thread for general hosting), and storage often does with thin provisioning, so on most hosts RAM is the limit.
The ZFS figure assumes Proxmox VE 8.1+'s default ARC limit (10% of RAM, up to 16 GB). Without ZFS, that memory is available for VMs.
Host Sizes
Questions
How many VMs can a 512 GB Proxmox server run?
About 110 VMs with 4 GB each, or 220 with 2 GB, leaving room for the host and ZFS.
Free Tools
More tools
Proxmox Resource CalculatorHow many VMs fit on a Proxmox host, with overcommit and reserves.Bandwidth CalculatorConvert Mbps to TB per month, and time a transfer at any speed.Subnet CalculatorNetwork, broadcast, usable range and mask for any IPv4 or IPv6 CIDR.MTU & MSS CalculatorWork out MTU and TCP MSS through VLANs, PPPoE, VXLAN and VPN tunnels.
Protect every VM on your Proxmox hosts
Frabs installs in one command on Proxmox VE and stops outbound abuse from any VM or container, without a reboot.