Vmware-umds.exe

vmware-umds.exe is a VMware Update Manager command line utility that doesn't receive much attention. Nonetheless, it's installed on the VUM server and may come in handy for you some day. A few of its uses are invoking the download of updates as well as exporting updates to an archive folder.

Another command line utility is vmware-updateDownloadCli.exe which can be used to import updates from an archive folder.
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VMotion CPU Compatibility

VMotion CPU Compatibility - Migrations Prevented Due to CPU Mismatch - How to Override Masks

This KB article provides information about overriding VMotion CPU compatibility restrictions between ESX hosts managed by VirtualCenter 2.x or vCenter Server 4.x. Warning: Unless indicated, VMware neither supports nor recommends modifying the VMotion constraints for CPU features used by applications.

http://kb.vmware.com/kb/1993
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New in VMware vSphere 4.0

What's New in VMware vSphere 4.0
Guided Consolidation Enhancements — The Guided Consolidation service is now a modular plug-in to vCenter Server. Guided Consolidation can concurrently analyze and make consolidation recommendations for up to 100 physical machines at a given time. See vSphere Basic System Administration http://www.vmware.com/pdf/vsphere4/r40/vsp_40_admin_guide.pdf
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vCenter Server

VMware recommends allocating at least 1GB RAM to the vCenter Server. Lab Manager 3 generates more activity within the vCenter Server than the daily interaction between the vCenter Server and the Virtual Infrastructure Client
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"Rolling Failover"

Older versions of vCenter used the term "Rolling Failover" to describe the recovery behavior of bonded PNICs. The settings were confusing:
Yes - The failed adapter is left inactive even after recovery until another active adapter fails
No - The adapter is returned to active duty immediately upon recovery

In the current version of vCenter, VMware has changed the term to "Failback" which is much more meaningful.
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Configuration Maximums

Configuration Maximums Comparison

ESX(i) hosts manageable by a vCenter Server:
vCenter Server 4.0 32-bit: 200 ESX(i) hosts
vCenter Server 4.0 64-bit: 300 ESX(i) hosts
vCenter Server 2.5 Update 4: 200 ESX(i) hosts
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New in VMware vSphere 4.0

What's New in VMware vSphere 4.0
Storage VMotion Enhancements — Storage VMotion can now be administered through vCenter Server and works across NFS, Fibre Channel, and iSCSI storage networking protocols. Virtual disk formats can be converted during a Storage VMotion session. See vSphere Basic System Administration http://www.vmware.com/pdf/vsphere4/r40/vsp_40_admin_guide.pdf
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