A vSphere administrator needs to place an ESXi host in maintenance mode to replace a hardware component. This host is a member of a Virtual SAN cluster that uses Automatic Mode Disk Groups. Availability of virtual machines running on this host is critical. HA and DRS are enabled on the Virtual SAN Cluster. Otherwise, the Virtual SAN cluster uses default values.
Which action should the administrator take to automatically guarantee availability of virtual machines with the fastest migration time?
A. Select Enter Maintenance Mode and accept the default values
B. Select Enter Maintenance Mode and select Full Data Migration option
C. Select Enter Maintenance Mode and select No Data Migration option
D. Migrate the virtual machines to another host and datastore then select Enter Maintenance Mode
Correct Answer: A
Explanation/Reference:
Explanation:
Before you shut down, reboot, or disconnect a host that is a member of a Virtual SAN cluster, you must put it in maintenance mode. When you place a host in maintenance mode, you can select a specific evacuation mechanism.
The default evacuation mechanism is “Ensure Accessibility”. When you power off or remove the host from the cluster, Virtual SAN ensures that all accessible virtual machines on this host remain accessible. Typically, only partial data evacuation is required which ensures the fastest migration time as required in this question.
Select this option if you take the host out of the cluster temporarily, for example, to install upgrades, and plan to have the host back in the cluster. This option is not appropriate when you permanently remove the host from the cluster.
Incorrect Answers:
B: With the Full Data Migration option, Virtual SAN evacuates all data to other hosts in the cluster and maintains or fixes availability compliance for the affected components in the cluster. This option results in the largest amount of data transfer and consumes the most time and resources. This does not meet the requirement of the fastest migration time. Therefore, this answer is incorrect.
C: With the No Data Migration option, Virtual SAN does not evacuate any data from the host. If you power off or remove the host from the cluster, some virtual machines might become inaccessible. This does not meet the requirement of ensuring the availability of the virtual machines. Therefore, this answer is incorrect.
D: Migrating the virtual machines to another host and datastore will take longer than the Ensure Accessibility option. This does not meet the requirement of the fastest migration time. Therefore, this answer is incorrect.
References:
http://pubs.vmware.com/vsphere-55/index.jsp#com.vmware.vsphere.storage.doc/GUID-521EA4BC-E411-47D4-899A-5E0264469866.html