If plan to upgrade your ESX 4.0 hosts to ESX 4.0 Update 1 and are running HP ProLiant gear, you should be aware of an issue that has been discovered:
On HP Proliant systems, 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
This issue occurs if you are running the HP Insight Manager agents on the ESX hosts. VMware will be releasing an updated installer for Update 1 in the near future, but the workaround for the time being is to disable the agents on the host prior to beginning the installation.
