Nutanix Certified Associate Practice Exam

After enabling Erasure Coding on a 5-node cluster with 200 TB raw disk space, approximately how much usable space would be available?

1. 100 TB

2. 150 TB

3. 200 TB

4. 250 TB

The correct answer is: 150 TB

Erasure Coding is a data protection technique that optimizes storage efficiency in distributed systems. When applied in a Nutanix cluster, it divides data into fragments, expands them with redundant data pieces, and distributes them across multiple nodes. This method allows the system to tolerate node failures while minimizing the amount of disk space consumed for redundancy. In a 5-node cluster, enabling Erasure Coding typically reduces the overall usable storage capacity as it requires some space to store the parity information for data redundancy. The exact overhead for Erasure Coding can vary depending on the specific configuration and the fault tolerance level, but a common rule of thumb is around 50% reduction in usable space when using a 5-node cluster with this feature enabled. Given that the raw disk space is 200 TB, if we apply the general expectation of losing about 50% of that space to Erasure Coding, we would calculate the usable space as follows: 200 TB raw space * (1 - 0.5) = 100 TB usable space. However, real-world usage patterns and actual configurations could lead to different utilization rates. In many scenarios, it's expected that you can efficiently utilize around 75% of the raw disk space after enabling Erasure Coding, potentially leading