Introduction to vSphere

Sep 2, 2010

📄 Contents

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What's New in This Release
Configuration Maximum Differences from VI3
Understanding the Licensing Changes
Summary

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Configuration Maximum Differences from VI3

We already covered many of the features and enhancements in vSphere and how they differ from VI3, but there are also many maximum configuration differences that you should be aware of. VMware publishes a configuration maximum document for each version that lists the maximums for VMs, hosts, and vCenter Servers. vSphere saw a number of these maximums increase, which really made a big difference in how well it could scale and the workloads it could handle. Tables 1.1 and 1.2 display the key configuration maximum differences between VI 3.5 and vSphere.

Table 1.1. Virtual Machine Configuration Maximum Differences

Virtual Machine	VI 3.5	vSphere 4
Virtual CPUs per VM	4	8
RAM per VM	64GB	255GB
NICs per VM	4	10
Concurrent remote console sessions	10	40

Table 1.2. ESX Host and vCenter Server Configuration Maximum Differences

ESX Host and vCenter Server	VI 3.5	vSphere 4
Hosts per storage volume	32	64
Fibre Channel paths to LUN	32	16
NFS datastores	32	64
Hardware iSCSI initiators per host	2	4
Virtual CPUs per host	192	512
VMs per host	170	320
Logical processors per host	32	64
RAM per host	256GB	1TB
Standard vSwitches per host	127	248
vNICs per standard vSwitch	1,016	4,088
Resource pools per host	512	4,096
Children per resource pool	256	1,024
Resource pools per cluster	128	512

The biggest differences in vSphere are the number of VMs that you can have per host and the amount of RAM and number of CPUs that you can assign to a VM. There is an important caveat to the number of VMs per host, though: If you have a single cluster that exceeds more than eight hosts, you can have only 40 VMs per host. Be aware of this limitation when sizing your host hardware and designing your virtual environment.

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