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I build and support on-premises "cloud" infrastructure. A small to midsize private cloud is a Linux based cluster of high performance computer nodes hosting two types of virtual private servers: LXC containers and KVM virtual machines. A typical server node can host 15-20 Linux containers or 5-10 KVM virtual machines with local ZFS storage. For example, a 5-node cluster may host up to 100 virtual private servers with aggregate 160 CPU cores, 1.25 TiB of memory and 100 TiB of data storage. It...