VM SCSI Controller Driver Select PVSCSI or LSI logic?

VMware, on the official blog today, said the use of PVSCSI storage adapter driver can improve 10-30% performance for high IO VMs. See

Http://blogs.vmware.com/performance/2010/02/highperformance-pvsci-storage-adapter-can-reduce-cpio-by-1030.html

We know that the default type of SCSI controller when creating VMS is the LSI Logic. Now under vsphere 4, you can select a new type PVSCSI (the option is VMware paravirtual), and this type can significantly reduce CPU workload. A further study of PVSCSI, see: Http://www.vmware.com/pdf/vsp_4_pvscsi_perf.pdf. about how to configure a VM's disk using PVSCSI driver, the specific approach to see here http://kb.vmware.com/kb/1010398

Note: The SCSI controller option under ESX3.5 is only LSI Logic (default) and BusLogic, while ESX4 is BusLogic Parallel, LSI Logic Parallel (default), LSI Logic SAS, VM Ware paravirtual these 4.

But do you want to choose PVSCSI or keep the original LSI logic drive? This KB of VMware (http://kb.vmware.com/kb/1017652.) Tell us: Only ioPS more than 2000 VM, and there is a stable number of interrupt, the use of PVSCSI to achieve better results, otherwise it will only cause latency increase, resulting in decreased performance.

Therefore, for a large number of IOPS is not high application, or save some strength, the default LSI logic drive is very good.

This article is from the "Delxu Live notepad" blog, please be sure to keep this source http://delxu.blog.51cto.com/975660/276830