Just stumbled over an interessting KB at vmware.com
With vShpere a new PVISCSI virtual disk controller has been introduced. The new controller is good for high IO intensive virtual machines. What is new (at least for me) is that it is better to use the LSI Logic controller for low-io workloads.
The KB states you should use the PVISCSI for vm’s with more than 2000 IOPS! That is a lot of IOPS, so just continue on using the LSI for most of your workloads.
- PVSCSI is best for workloads that drive more than 2000 IOPS and 8 outstanding I/Os.
- LSI Logic is best for workloads that drive lower I/O rates and fewer outstanding I/Os.