In case you missed it, VMware has released update 4 (U4) for ESX 3.5 and ESXi. And if you haven't already applied it, note that there are plenty of good reasons in this update as to why you would want to apply it.
Before doing so, make sure you read over the VMware Update 4 Release Notes and check out the ESX Server and VirtualCenter version compatibility matrix which shows the compatibility between different combinations of versions. As an example, please note that VMware ESX 3.5 Update 4 is not compatible with versions of VirtualCenter 2.4 Update 2 and before.
This version of ESX Server also requires a VMware Tools upgrade.
The new Update 4 (build 153875) includes:
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Expanded Support for Enhanced vmxnet Adapter — This version of ESX Server includes an updated version of the VMXNET driver (VMXNET enhanced)
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Enablement of Intel Xeon Processor 5500 Series — Support for the Xeon processor 5500 series has been added.
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QLogic Fibre Channel Adapter Driver Update — This release provides interoperability fixes for QLogic Management Tools for FC Adapters and enhanced NPIV support.
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Emulex Fibre Channel Adapter Driver Update — This release provides support for the HBAnyware 4.0 Emulex management suite.
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LSI megaraid_sas and mptscsi Storage Controller Driver Update — The upgrade improves performance and enhance event handling capabilities for these two drivers.
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Newly Supported Guest Operating Systems — Support for the following guest operating systems has been added specifically for this release:
- SUSE Linux Enterprise Server 11 (32-bit and 64-bit).
- SUSE Linux Enterprise Desktop 11 (32-bit and 64-bit).
- Ubuntu 8.10 Desktop Edition and Server Edition (32-bit and 64-bit).
- Windows Preinstallation Environment 2.0 (32-bit and 64-bit).
- Newly Supported Management Agents - VMware ESX Server Supported Hardware Lifecycle Management Agents
- Newly Supported I/O Devices - SAS Controllers and SATA Controllers, Network Cards, Onboard Management Processors, Sun Storage Arrays