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LSI SAS HBA is unable to see the LUNs after upgrading to ESXi 5.x (2034740)

After upgrading to ESXi 5.x, LSI SAS adapters fail to discover LUNs on directly connected Serial Attached Storage (SAS)
One HBA may see the LUN, but logs show many entries similar to:

write errors / Latency
mpt2sas is upgraded to the latest version 06.00.00.00-6vmw
Boot logs show that the drivers are properly loaded and drivers are not reporting any errors

This issue occurs when Virtual Technology for Direct I/O (VT-d) is enabled on host processors.

To resolve this issue,disable VT-d from the host BIOS. For more information see, vHBAs and other PCI devices may stop responding in ESX/ESXi 4.1/ESXi 5.0 when using Interrupt Remapping (1030265).

Note: Disabling VT-d also disables some of the other features that it provides, such as DMA remapping and Interrupt remapping.

For more information, consult your hardware vendor.

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.

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