Which controller is recommended for high disk I/O workloads?
A. BusLogic Parallel
B. LSI Logic Parallel
C. LSI Logic SAS
D. VMware Paravirtual
Correct Answer: D
Explanation/Reference:
Explanation:
When you select a custom configuration, the New Virtual Machine wizard prompts you to select the I/O controller type for the virtual machine.
For the SCSI controller, you can choose BusLogic, LSI Logic, or LSI Logic SAS. If you are creating a remote virtual machine on an ESX host, you can also select a VMware Paravirtual SCSI (PVSCSI) adapter.
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.
Incorrect Answers:
A: The BusLogic Parallel controller is not recommended for high disk I/O workloads. The LSI Logic controller performs better and the PVSCSI controller performs better still. Therefore, this answer is incorrect.
B: The LSI Logic Parallel controller is not recommended for high disk I/O workloads. The PVSCSI controller offers improved performance over the LSI Logic Parallel controller. Therefore, this answer is incorrect.
C: The LSI Logic SAS controller is not recommended for high disk I/O workloads. The PVSCSI controller offers improved performance over the LSI Logic SAS controller. Therefore, this answer is incorrect.
References:
http://pubs.vmware.com/workstation-10/index.jsp?topic=%2Fcom.vmware.ws.using.doc%2FGUID-A0438F6C-6651-4A38-853A-0A7A494E23DF.html
Explanation/Reference:
Explanation:
When you select a custom configuration, the New Virtual Machine wizard prompts you to select the I/O controller type for the virtual machine.
For the SCSI controller, you can choose BusLogic, LSI Logic, or LSI Logic SAS. If you are creating a remote virtual machine on an ESX host, you can also select a VMware Paravirtual SCSI (PVSCSI) adapter.
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.
Incorrect Answers:
A: The BusLogic Parallel controller is not recommended for high disk I/O workloads. The LSI Logic controller performs better and the PVSCSI controller performs better still. Therefore, this answer is incorrect.
B: The LSI Logic Parallel controller is not recommended for high disk I/O workloads. The PVSCSI controller offers improved performance over the LSI Logic Parallel controller. Therefore, this answer is incorrect.
C: The LSI Logic SAS controller is not recommended for high disk I/O workloads. The PVSCSI controller offers improved performance over the LSI Logic SAS controller. Therefore, this answer is incorrect.
References:
http://pubs.vmware.com/workstation-10/index.jsp?topic=%2Fcom.vmware.ws.using.doc%2FGUID-A0438F6C-6651-4A38-853A-0A7A494E23DF.html