Long White Virtual Clouds

I’ve started to see reports recently of I/O errors when running very high I/O workloads on Windows 2008 and Windows 2008 R2 VM’s. Mostly this was during artificial benchmark tests run against MS SQL and Exchange 2010 with Jetstress. However it could impact production workloads. Upon further investigation it appears these I/O errors are a known defect with a certain version of the PVSCSI driver that comes with VMware Tools and can affect vSphere 4.0 U1, 4.1 and 5.0. Here I’ll cover more about this potentially serious issue and how to fix it.

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