Known issue’s:

When attempting to upgrade ESX 4.0 to ESX 4.0 Update 1 (U1), you may experience these symptoms:

• Upgrade operation may fail or hang and can result in an incomplete installation
• Upon reboot, the host that was being upgraded may be left in an inconsistent state and may display a purple diagnostic screen with the following error:
  COS Panic: Int3 @ mp_register_ioapic

To download the newest (re-released) Update 1 check url:

http://downloads.vmware.com/d/info/datacenter_downloads/vmware_vsphere_4/4

Symptoms:

Upgrading virtual hardware in ESX 4 may cause Windows 2008 disks to go offline. 
Upgrading virtual hardware from version 4 to version 7 may cause Windows 2008 disks to go offline.
Creating a new virtual machine on hardware version 7 may cause Windows 2008 disks to go offline.
Note: The first disk (C: drive) is not affected. Any additional disks may be affected and show marked as Offline within Disk Management.
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When attempting to upgrade ESX 4.0 to ESX 4.0 Update 1, you may experience the following symptoms:

• Update Manager (VUM) upgrade operation fails or times out at 33%.
• Upon reboot, the host that was being upgraded displays a purple diagnostic screen with the following error:
  COS Panic: Int3 @ mp_register_ioapic  

Customers using VMware vSphere 4 upgrading to Update 1 with 3^rd party management agents running.
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What’s New

The following information provides highlights of some of the enhancements available in this release of VMware ESX:

VMware View 4.0 support – This release adds support for VMware View 4.0, a solution built specifically for delivering desktops as a managed service from the protocol to the platform.

Windows 7 and Windows 2008 R2 support –This release adds support for 32-bit and 64-bit versions of Windows 7 as well as 64-bit Windows 2008 R2 as guest OS platforms. In addition, the vSphere Client is now supported and can be installed on a Windows 7 platform. For a complete list of supported guest operating systems with this release, see the VMware Compatibility Guide.

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