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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?
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Question 99 - NCS-Core discussion

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An administrator needs to make sure an RF2 cluster can survive a complete rack failure without negatively effecting workload performance. The current cluster configuration consists of the following:

* 30 nodes: distributed 10 nodes per rack across three 42U rack

* Each nodes is configured with 40TB usable storage all flash (Cluster Total 1.2 PB Usable)

* Current cluster utilization is 900TB storage

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

A.
Expanse the cluster by adding 3 additional nodes per rack, 9 nodes total.
Answers
A.
Expanse the cluster by adding 3 additional nodes per rack, 9 nodes total.
B.
Expanse the cluster by adding 2 additional nodes per rack, 6 nodes total.
Answers
B.
Expanse the cluster by adding 2 additional nodes per rack, 6 nodes total.
C.
Expanse the cluster by adding 9 nodes to a new 42U rack
Answers
C.
Expanse the cluster by adding 9 nodes to a new 42U rack
D.
Expanse the cluster by adding 8 nodes to a new 42U rack
Answers
D.
Expanse the cluster by adding 8 nodes to a new 42U rack
Suggested answer: A

Explanation:

In Nutanix, a cluster with RF2 (Redundancy Factor 2) can tolerate the failure of a single node or drive1. However, to ensure that the cluster can survive a complete rack failure without negatively affecting workload performance, we need to consider rack awareness. When rack fault tolerance is enabled, the cluster has rack awareness and the guest VMs can continue to run with failure of one rack (RF2) or two racks (RF3).The redundant copies of guest VM data and metadata exist on other racks when one rack fails2.

Given the current cluster configuration (30 nodes distributed 10 nodes per rack across three 42U racks), adding 3 additional nodes per rack (9 nodes total) would increase the redundancy of the cluster and improve its ability to withstand a complete rack failure. This is because the additional nodes would provide more storage capacity and compute resources, allowing the cluster to continue running workloads even if one rack fails.

Understanding Fault Domains and Rack Awareness | Nutanix Community

RF2 -> RF3 | Requirements | Nutanix Community

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asked 23/09/2024
Eduardo Collado
29 questions
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