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Daemons/Services

The maximum size allowed in a vSphere virtual machine is 2TB minus 512B. This is true even for VMs living on NFS volumes which aren't restricted by the 2TB -512B VMFS volume size limit. This true for RDMs as well.

http://www.vmware.com/pdf/vsphere4/r41/vsp_41_config_max.pdf
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Network Communication Port

Network Communication Ports for VMware Virtual Infrastructure
443, 902, 903, 2049, 2050-2250,
3260, 8000, 8042-8045, 27000, 27010

For a few different diagrams, see: http://bit.ly/bd7vXC
Here's another great one, the most thorough yet: http://bit.ly/cgzAbx
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vSphere Host Profiles

vSphere Host Profiles cannot be created from scratch and only two methods exist to create a Host Profile:

1. A Host Profile can be generated from an existing ESX or ESXi host
2. A Host Profile can be imported from a .VPF file which was previously exported

However, once created, Host Profiles can be fine tuned in an editor.
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Journaling

By default, VMs which are bound to an internal vSwitch (that is, a vSwitch with no pNIC uplinks) cannot be vMotioned. This behavior can be altered by adding the following to the config flag in the vCenter vpxd.cfg file:
[migrate]
[test]
[CompatibleNetworks]
[VMOnVirtualIntranet]false[/VMOnVirtualIntranet]
[/CompatibleNetworks]
[/test]
[/migrate]
http://kb.vmware.com/kb/1006701
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Configuration Maximums Comparison

Configuration Maximums Comparison

Linked Mode for vCenter Server 4.1:
Linked vCenter Server system: 10 vCenter Servers
ESX(i) hosts in Linked Mode environment: 3,000 ESX(i) hosts
Powered-on VMs in Linked Mode environment: 30,000 VMs
Registered VMs in Linked Mode environment: 50,000 VMs

vCenter Server 2.5 and below does not support Linked Mode
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New in VMware vSphere 4.1

What's New in VMware vSphere 4.1

Windows Failover Clustering with VMware HA - Clustered Virtual Machines that utilize Windows Failover Clustering/Microsoft Cluster Service are now fully supported in conjunction with VMware HA.

http://vmware.com/pdf/vsphere4/r41/vsp_41_mscs.pdf
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