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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Daniel Buonocore

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This article provides steps which may be useful when upgrading to ESX 4.0 and vCenter 4.0.

Note: This article assumes that you have read the vSphere Upgrade Guide. This upgrade guide contains definitive information. If there is a discrepancy between the guide and this article, assume that the guide is correct.

Note: Read the VMware vSphere 4.0 Release Notes for known installation issues.

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Daniel Buonocore

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