What is the purpose of configuring a VMkernel port for Fault Tolerance logging?
A. The selected vmkernel port is used to send external inputs from a primary virtual machine to its secondary counterpart.
B. The selected vmkernel port is able to log Fault Tolerance events to a syslog server.
C. The selected vmkernel port is used to trigger a failover from the primary machine if a hardware crash occurs.
D. The selected vmkernel port is able to maintain a log of changes to the secondary virtual machine.
Correct Answer: A
Explanation/Reference:
Explanation:
Inputs received by the primary VM are sent to the secondary VM using the vmkernel port. This ensures that the secondary VM is up-to-date with the primary VM. The VMkernel port for Fault Tolerance logging is used to transfer the inputs from the primary to the secondary VM.
You can enable Fault Tolerance for most mission critical virtual machines. A duplicate virtual machine, called the Secondary VM, is created and runs in virtual lockstep with the Primary VM. VMware vLockstep captures inputs and events that occur on the Primary VM and sends them to the Secondary VM, which is running on another host. Using this information, the Secondary VM’s execution is identical to that of the Primary VM. Because the Secondary VM is in virtual lockstep with the Primary VM, it can take over execution at any point without interruption, thereby providing fault tolerant protection.
FT logging traffic between Primary and Secondary VMs is unencrypted and contains guest network and storage I/O data, as well as the memory contents of the guest operating system. This traffic can include sensitive data such as passwords in plaintext. To avoid such data being divulged, ensure that this network is secured, especially to avoid ‘man-in-the-middle’ attacks. For example, you could use a private network for FT logging traffic.
On each host that you want to add to a vSphere HA cluster, you must configure two different networking switches so that the host can also support vSphere Fault Tolerance.
Fault Tolerance Traffic:
The traffic that the primary fault tolerant virtual machine sends to the secondary fault tolerant virtual machine over the VMkernel networking layer. A separate VMkernel adapter for Fault Tolerance logging is required on every host that is part of a vSphere HA cluster.
Incorrect Answers:
B: This is not the purpose of the VMkernel port for Fault Tolerance logging. Therefore, this answer is incorrect.
C: This is not the purpose of the VMkernel port for Fault Tolerance logging. Therefore, this answer is incorrect.
D: This is not the purpose of the VMkernel port for Fault Tolerance logging. Therefore, this answer is incorrect.
References:
https://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.avail.doc/GUID-623812E6-D253-4FBC-B3E1-6FBFDF82ED21.html
https://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.networking.doc/GUID-D4191320-209E-4CB5-A709-C8741E713348.html
