My current lab consists of a single Hewlett Packard Proliant DL380 G6. The hardware specifications are:
Model: ProLiant DL380 G6
Processor Type: Intel(R) Xeon(R) CPU X5560 @ 2.80GHz
Logical Processors: 16
2X Samsung evo SSD in raid0: 220GiB
1X Samsung HD103SJ: 915GiB
On this i have installed: VMware ESXi, 6.5.0 VMware vCenter 6.5.0 I am also running a windows server 2012 R2 server which takes care of ldap authentication (Active Directory) and DNS. The ip addresses are: ESXI: 192.168.1.222 vCenter: 192.168.1.223 W2012R2: 192.168.1.200 The dns server is authoritative for lab.caarels.com. So in summary: Basic vCenter environment with single sign-on authentication provided by microsoft active directory.