Home » Cisco » 300-175 » Which two options are characteristics of a virtual machine that is deployed by using VMFEX in high-performance mode in this environment?
You have a Cisco UCS server connected to Cisco Fabric Interconnects. Which two options are characteristics of a virtual machine that is deployed by using VMFEX in high-performance mode in this environment? (Choose two.)
A. The virtual machine connects to a Cisco VIF on the external switch by using Cisco VN-Link in hardware, bypassing the hypervisor.
B. The dynamic vNIC can connect redundantly by using hardware-based failover to the Cisco UCS Fabric interconnect cluster.
C. Dynamic vNICs inherit parameters from static vNICs
D. The virtual machine can share the same dynamic vNIC with another virtual machine in VMFEX high- performance mode
E. The virtual machine deployed in VM-FEX high-performance mode runs on the host by using the default BIOS policy that is available in the Cisco UCS Manager
Correct Answer: AB
Explanation/Reference:
https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/vm_fex/vmware/gui/config_guide/b_GUI_VMware_VM-FEX_UCSM_Configuration_Guide/b_GUI_VMware_VMFEX_UCSM_Configuration_Guide_chapter_01.html
In high-performance mode, traffic to and from a virtual machine (VM) bypasses the DVS and hypervisor. Traffic travels directly between VMs and the virtual interface card (VIC) adapter.
The benefits of high-performance mode are as follows: Increases I/O performance and throughput.
Decreases I/O latency.
Improves CPU utilization for virualized I/O-intensive applications.
You must modify or create several policies in order for VM-FEX for VMware to function optimally:
VMwarePassThrough Ethernet Adapter Policy (high-performance mode only)
Dynamic vNIC Connection Policies
BIOS Policy (high-performance mode only)
VM Lifecycle Policy
Dynamic vNICs are always protected in Cisco UCS, but this field allows you to select a preferred fabric, if any. You can choose one of the following:
Protected Pref A-Cisco UCS attempts to use fabric A but fails over to fabric B if necessary
Protected Pref B-Cisco UCS attempts to use fabric B but fails over to fabric A if necessary Protected—Cisco UCS uses whichever fabric is available
