A company must keep regulatory records for at least seven years. The data is seldom accessed but must remain immutable and available if auditors request it. Which storage strategy is the MOST cost-effective while still meeting these requirements?
Keep the records on high-performance SSD block storage for quick random I/O.
Move the data to a cold/archive object-storage tier that supports write-once-read-many (WORM) retention.
Replicate the dataset to an in-memory database cluster to speed retrieval.
Configure lifecycle rules to delete the data after 90 days to free capacity.
A cold or archive object-storage tier (for example, AWS S3 Glacier or Azure Blob Cold) is designed for data that is rarely read yet must be retained for long periods. It offers the lowest per-gigabyte cost and supports compliance features such as object-lock/WORM. In-memory replication targets high-throughput, low-latency workloads and is far more expensive. High-performance SSD block storage also costs significantly more per gigabyte than cold/archive tiers. Deleting data after 90 days violates the seven-year retention requirement, so it fails to meet the business objective.
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Why is high-performance SSD storage not suitable for this use case?