正解:D
* Erasure Coding (EC) Analysis:
* Erasure Coding is a Nutanix feature that provides efficient storage utilization by distributing data across multiple nodes.
* Write-cold Data Requirement:
* Write-cold duration: Data must be 'write-cold' for a specific period before Erasure Coding can begin optimization.
* Duration: The required duration for data to be considered 'write-cold' is 7 days.
* Explanation:
* Erasure Coding optimizes storage usage by encoding data across nodes. However, this process is applied to data that is infrequently accessed or modified.
* The 7-day period ensures that the data is stable and not subject to frequent changes, making it suitable for EC optimization.
* Outcome:
* After 7 days of being 'write-cold', the data will be eligible for Erasure Coding, thereby optimizing storage efficiency while maintaining data resiliency.
References: For more details on Erasure Coding and its operational requirements, refer to Nutanix documentation on storage optimization and EC processes.