zfs arc - RackNotes

Proxmox RAM Sizing: How Much Do You Really Need? (2026)

May 29, 2026May 23, 2026 by racknotes

Proxmox RAM sizing breakdown — host overhead, ZFS ARC, and VM allocation

7 min readHow much RAM does Proxmox actually need — not what the docs say. Practical sizing for VMs, ZFS ARC, ballooning tradeoffs, and when to upgrade vs partition workloads.