For a bare minimum installation, the requirements seem incredibly low by today’s standards, but they are deceptive.
At least 8 GB is recommended to provide sufficient resources for the ESXi hypervisor itself and its virtual machines. vmware esxi 5.5 requirements
Before installing or upgrading to ESXi 5.5, consider the following: For a bare minimum installation, the requirements seem
For VM storage, ESXi 5.5 supports Local Storage (SATA/SAS), Fibre Channel SAN, iSCSI, and NAS over NFS. 4. Network Requirements For a bare minimum installation