VMware ESX 4.0 Update 1 and Later and vCenter Server 4.0 Update 1 and Later


ESX and vCenter Server Installation Guide : ESX Partitioning

ESX Partitioning
ESX hosts have required and optional partitions.
/boot and vmkcore are physical partitions. /, swap, /var/log, and all the optional partitions are stored on a virtual disk called esxconsole-<system-uuid>/esxconsole.vmdk. The virtual disk is stored in a VMFS volume.