A customer defines a requirement to minimize the vMotion migration time during a maintenance period. The servers being used are equipped with eight 1 GbE network adapters.
Per the defined logical network configuration, there are two network adapters each used for:
✑ Management traffic
✑ vMotion traffic
✑ iSCSI traffic
✑ Virtual machine traffic
Which design decision should the architect make to meet the customer requirement?
To minimize the vMotion migration time during a maintenance period, the architect should implement Multi-NIC vMotion by adding additional vMotion VMkernel interfaces. By using multiple VMkernel adapters for vMotion, the vMotion process can utilize multiple network streams simultaneously, thereby increasing the available bandwidth for vMotion traffic and reducing the overall migration time. This approach takes advantage of the dedicated network adapters already assigned to vMotion traffic, ensuring that they are fully utilized for faster migrations.
B. Implement Multi-NIC vMotion by adding additional vMotion VMkernels. We maintain the 2 x 1 GbE network adapters for vMotion and then configure multiple VMkernel interfaces using the same NIC and network. Each time you add a VMkernel adapter and enable it for vMotion, you create a new stream. With more streams, there is greater bandwidth utilization.
Im going to go with B https://kb.vmware.com/s/article/2007467 https://communities.vmware.com/t5/VMware-vSphere-Discussions/vmotion-load-balanced-across-multiple-uplinks-on-distributed/td-p/491336 https://www.virtuallyboring.com/multi-nic-vmotion/ Even though 2 x network adapters are dedicated to vMotion, only 1 of the uplinks will be used during a vMotion activity if only one vMotion vmkernel is configured. Adding an additional vmkernel will allow both to be used. Per the VMware KB above "After making these configuration changes, when you initiate a vMotion, multiple NIC ports are used. Even when performing a vMotion on just one virtual machine, both links are used." Also the question states "Per the defined logical network configuration, there are two network adapters each" which suggests that changing this to combine vMotion/Mgmt traffic may not be possible based on the customers requirements (as the logical network architecture is already defined by them)
A-WRONG: There are already 2 network adapters "reserved" for vMotion traffic B-WRONG: Just adding vMotion-enabled vmkernel ports without connecting them to additional NICs will not improve performance: "To distribute and allocate more bandwidth to vMotion traffic across several PHYSICAL NICs, use multiple-NIC vMotion." https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html C-COULD BE if there was no better option (in this case, letter D): https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-5211FD4B-256B-4D9F-B5A2-F697A814BF64.html#GUID-5211FD4B-256B-4D9F-B5A2-F697A814BF64 D-RIGHT (better option): "Direct vMotion traffic to one or more physical NICs that have high-bandwidth capacity and are shared between other types of traffic as well" https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html
Networking Best Practices https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-B57FBE96-21EA-401C-BAA6-BDE88108E4BB.html Isolate from one another the networks for host management, vSphere vMotion, vSphere FT, and so on, to improve security and performance. Keep the vSphere vMotion connection on a separate network. When migration with vMotion occurs, the contents of the guest operating system’s memory is transmitted over the network. You can do this either by using VLANs to segment a single physical network or by using separate physical networks (the latter is preferable). note: by using separate physical networks is preferable. D. Combine vMotion and Management traffic also never mentions the use of VLANs either Have a read here https://blogs.vmware.com/vsphere/2019/09/how-to-tune-vmotion-for-lower-migration-times.html
https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html "In vSphere 7.0 Update 1 or earlier, vMotion SATURATES 1 GbE and 10 GbE physical NICs with a SINGLE VMOTION VMKERNEL NIC. Starting with vSphere 7.0 Update 2, vMotion SATURATES high speed links such as 25 GbE, 40 GbE and 100 GbE with a SINGLE VMOTION VMKERNEL NIC."
From the VMware blogs link you provided: "Do not confuse this with Multi-NIC vMotion."
I think B should be used as d can choke management traffic and still it won’t use all 4 nics unless multi-nic is applied https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vcenterhost.doc/GUID-7DAD15D4-7F41-4913-9F16-567289E22977.html
B would be the correct answer
B. by logical design you have four vswitch with two 1 Gb network adapter each. So best performance acieved with Multi-NIC vMotion. Two IP address on the switch making use of dedicated pnic for each vmkernel port.
Correct Answer : D
D is wrong to me when you vmotion 1 VM, D won't help to minimize time but B does. 'customer defines a requirement to minimize the vMotion migration time during a maintenance period'
Seems you are just answering without thinking. vMotion can only make use of one single pNIC at a time, therefore the only way to make better use of the eight 1 gbps adapters is creating additional vMotion vmkernels and bind them to a pnic by using dedicated Failover Policies. More info: https://kb.vmware.com/s/article/2007467 Correct Answer: B
I thnik D
Answer B is correct. By simply implementing multi-NIC vMotion, you will have more bandwith for the live migration of the VMs, and their migration time will be reduced.. A : vMotion automatically tries to use as much bandwith as possible. Setting a reservation won't help, and will degrade the other traffics. In addition, the bandwith is unusable when not doing vMotion operations. C : this help isolate the network, for security reasons. It won't help for performance D : Putting more adapters will not help if multi-NIC vMotion is not implemented.
B. Implement Multi-NIC vMotion by adding additional vMotion VMkernels. https://kb.vmware.com/s/article/2007467
Since there are 2 NICs for vMotion and it doesn't say anything about being shared with other services, Stack or I/O Control will not have any improvements here. So I will say B adding a multi nic vMotion with adicional VMkernels
"To distribute and allocate more bandwidth to vMotion traffic across several physical NICs, use multiple-NIC vMotion." - B
They are already using Multi-Nic with 2 pNICs associated for vMotion. Where are you getting more pNICs than the 2 already allocated? You would need to leverage mgmt pNICs.