Infrastructure limitations of ESX 4.0 VMware
Some limitations in ESX Server 4 may constrain the design of data centers:
- Guest system maximum RAM: 255 GB
- Host system maximum RAM: 1TB
- Number of hosts in an HA cluster: 64
- Number of hosts in a DRS cluster: 64
- Maximum number of processors per virtual machine: 8
- Maximum number of processors per host: 64
- Maximum number of cores per processor: 6
Performance limitations
In terms of performance, virtualization imposes a cost in the additional work the CPU has to perform to virtualize the underlying hardware. Instructions that perform this extra work, and other activities that require virtualization, tend to lie in operating system calls. In an unmodified operating system, OS calls introduce the greatest portion of virtualization overhead.
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