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Question 32

An administrator needs to make sure an RF3 cluster can survive a failure of two complete racks without negatively affecting performance. The current cluster configuration consists of the following:

✑ 30 All Flash Nodes: distributed 10 nodes per rack across three 42U racks

✑ Each node is configured with 20TB usable storage all flash (Cluster Total 600TB Usable)

✑ Current cluster utilization is 500TB storage

✑ Storage containers have Erasure Coding enabled

Which configuration changes should be made to make sure the cluster meets the requirements?

    Correct Answer: B

    The administrator needs to ensure that the RF3 cluster can survive the failure of two complete racks without affecting performance. Given the current configuration, the cluster has 30 nodes with a total of 600TB usable storage, with Erasure Coding enabled. To maintain performance and data integrity, the cluster needs to avoid being over or under capacity when two racks fail. Expanding the cluster to 48 nodes distributed evenly across 6 racks provides better distribution and fault tolerance, while aligning with the requirement to survive up to two complete rack failures. With 48 nodes, the cluster will still have adequate capacity and redundancy to handle the 500TB current utilization after losing two racks, thus ensuring optimal performance and data protection.

Discussion
sa12Option: A

"A" could be correct too, with 5, 10 node rack we will have 1000TB total cluster capacity. If we deduct the 500TB in use, we can still lose two racks (total of 400TB) and still maintain two copies of each block of data on the cluster.

lski

Erasure Coding requires an additional rack.