Disk Controller Benchmarks: VMware Paravirtual's vs. LSI Logic Parallel's
Is it worth switching your VMware vSphere VM’s SCSI (small computer system interface) from the LSI Logic Parallel controller to the VMware Paravirtual SCSI controller? Except for ultra-high-end database servers (> 1M IOPS ( input/output operations per second)), the answer is “no”; the difference is negligible. Our benchmarks show that VMware’s Paravirtual SCSI (small computer system interface) controller offered a 2-3% performance increase in IOPS (I/O (input/output) operations per second) over the LSI Logic Parallel SCSI controller at the cost of a similar decrease in sequential performance (both read & write). Additionally the Paravirtual SCSI controller (pvscsi) had a slight reduction in CPU (central processing unit) usage on the host (best-case scenario is 3% lower CPU usage). ...