Which controller is recommended for high disk I/O workloads?
A.
BusLogic Parallel
B.
LSI Logic Parallel
C.
LSI Logic SAS
D.
VMware Paravirtual
Explanation:
Which controller is recommended for high disk I/O workloads?
Which controller is recommended for high disk I/O workloads?
D is correct
PVSCSI adapters are high-performance storage adapters that can provide greater throughput and lower CPU utilization. They are best suited for environments where hardware or applications drive a very high amount of I/O throughput, such as SAN environments. PVSCSI adapters are not suited for DAS environments.
http://pubs.vmware.com/workstation-10/index.jsp?topic=%2Fcom.vmware.ws.using.doc%2FGUID-A0438F6C-6651-4A38-853A-0A7A494E23DF.html
http://blogs.vmware.com/vsphere/2014/02/vscsi-controller-choose-performance.html
PVSCSI and LSI Logic Parallel/SAS are essentially the same when it comes to overall performance capability. PVSCSI, however, is more efficient in the number of host compute cycles that are required to process the same number of IOPS. This means that if you have a very storage IO intensive virtual machine, this is the controller to choose to ensure you save as many cpu cycles as possible that can then be used by the application or host. Most modern operating systems that can drive high IO support one of these two controllers.
Paravirtual SCSI (PVSCSI) adapters are high performance storage adapters that can result in greater throughput and lower CPU utilization. PVSCSI adapters are best suited for high performance storage environments.
https://pubs.vmware.com/vsphere-4-esx-vcenter/index.jsp?topic=/com.vmware.vsphere.vmadmin.doc_41/vsp_vm_guide/creating_virtual_machines/c_about_paravirt_scsi.html