An administrator has 24 physical servers that need to be configured with vSAN. The administrator needs to ensure that a single rack failure is not going to affect the data availability. The number of racks used should be minimized.
What has to be done and configured to achieve this goal?
To ensure data availability in a vSAN configuration while handling a single rack failure, the servers should be distributed across at least three different racks, and three fault domains should be configured. This setup guarantees that the loss of one rack does not compromise data availability, as vSAN requires a minimum of three fault domains to support data redundancy and availability with a Failures to Tolerate (FTT) of 1.
To ensure that a single rack failure does not affect data availability in a vSAN cluster while minimizing the number of racks used, you should do the following: D. Distribute servers across at least three different racks and configure three fault domains. This approach separates the servers across multiple racks to avoid data loss due to a single rack failure. Configuring three fault domains ensures that vSAN can tolerate the loss of an entire rack while maintaining data availability. It's a good practice for fault tolerance while keeping the number of racks to a minimum.
D is correct, A minimum of three fault domains are required to support FTT=1
D is Correct
If fault domains are enabled, vSAN applies the active virtual machine storage policy to the fault domains instead of the individual hosts. Calculate the number of fault domains in a cluster based on the Failures to tolerate (FTT) attribute from the storage policies that you plan to assign to virtual machines. number of fault domains = 2 * FTT + 1
D. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.vsan-planning.doc/GUID-FE7DBC6F-C204-4137-827F-7E04FE88D968.html#:~:text=vSAN%20requires%20at%20least%20three,an%20individual%20computing%20rack%20enclosure.
Fault Domains should be 3
Answer D is correct
In the context of your initial question about distributing 24 servers across racks to survive rack failure, distributing them across two racks and configuring two fault domains should be enough to survive a single rack outage. The key is to ensure that copies of data (and their witness components) are distributed across the two fault domains capturing these two racks so that losing one rack doesn't result in loss of any data. Hence, option A. Option D would indeed provide a higher level of redundancy, allowing for the failure of two racks concurrenty without data loss, but under the constraint of trying to "minimize the number of racks used," two racks will suffice to handle a single rack failure.
Unless you create a stretched cluster, you cannot have only 2 fault domains. The minimum to achieve FTT=1 is to have 3 fault domains, so 3 racks.