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Infrastructure limitations ESX Server 4 vs ESXI 5

Some limitations in ESX Server 4 may constrain the design of data centers:[28][29]

• Guest system maximum RAM: 255 GB
• Host system maximum RAM: 1 TB[28]
• Number of hosts in a high availability cluster: 32
• Number of Primary Nodes in ESX Cluster high availability: 5
• Number of hosts in a Distributed Resource Scheduler cluster: 32
• Maximum number of processors per virtual machine: 8
• Maximum number of processors per host: 160
• Maximum number of cores per processor: 12
• Maximum number of virtual machines per host: 320
• VMFS-3 limits files to 262,144 (218) blocks, which translates to 256 GB for 1 MB block sizes (the default) or up to 2 TB for 8 MB block sizes.[30] However, on a VMFS Boot drive, it is usually very difficult to use anything other than 1 MB Block size [31].

With ESXI 5 there has been some changes to these limits[32]

• Guest system maximum RAM: 1 TB
• Host system maximum RAM: 2 TB
• Number of hosts in a high availability cluster: 32
• Maximum number of processors per virtual machine: 32
• Maximum number of processors per host: 160
• Maximum number of cores per processor: 25
• Maximum number of virtual machines per host: 512
• VMFS-3 is supported and has the same limits as before
• VMFS-5 however has a max volume size of 64 TB and a max file size of 2 TB - 512 B
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