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PVSCSI Bug Causing Exchange 2010 Jetstress to Crash

A few weeks back I was called in to help a customer who was experiencing problems completing Jetstress testing for an Exchange 2010 deployment. It wasn’t an issue of Jetstress reporting failed tests. Rather, they were unable to get through most of their tests without the Jetstress application actually crashing (JetstressWin.exe has stopped working). They would see the following after the Jetstress testing completed but before it could write any log files to disk. The only Jetstress related error in

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Using PVSCSI Driver on Windows Server 2012 VMs

Are you looking to start testing Windows Server 2012 in your vSphere environment and want to utilize the PVSCSI driver for better potential disk performance and lower CPU utilization?  You may have noticed that the only PVSCSI drivers available for Windows stop at Windows 2008.  But will that work on your Windows 2012 VM? In short, it sure will!  I gave it a try and can confirm that loading the Windows 2008 PVSCSI driver on your Windows 2012 VM will

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More vSphere 4.1 Enhancements – Welcome Back PVSCSI Driver!

As I keep digging into documents and KB articles I keep finding more and more things to like about vSphere 4.1.  Today’s find has to do with the PVSCSI driver. With the release of vSphere 4.0, VMware added a new paravirtualized SCSI driver into the VMware Tools that provides better virtual disk performance than the standard LSI driver.  The PVSCSI driver promised to deliver better performance and lower overall CPU utilization for workloads that had high I/O demands.  Unfortunately the
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