In the context of ECS Solution Design for Data Management, which of the following are key considerations for ensuring high data durability?

Question

Options

• AImplementing erasure coding for object storage
• BUsing magnetic tape as the primary storage medium
• CReplicating data across different storage media types
• DEnsuring data integrity through checksums and hash functions

• A
  80% (12)
• B
  20% (3)

Explanation

High data durability in ECS (Elastic Cloud Storage) Solution Design requires a layered approach: A (erasure coding) protects object data by splitting it into fragments with mathematical redundancy, allowing reconstruction even if multiple drives or nodes fail - far more storage-efficient than full replication alone. C (cross-media replication) guards against media-class failures by ensuring no single physical failure mode can destroy all copies. D (checksums and hash functions) silently detect data corruption ("bit rot") before it propagates, so the system can trigger repair before data is permanently lost.

B is wrong because magnetic tape is an archival/cold-storage medium with high latency and mechanical fragility - it is never appropriate as a primary storage medium in a durability-focused ECS design.

Memory tip: Think of durability as three shields - Survive failures (erasure coding), Survive media death (replication across media types), Survive silent corruption (checksums). Tape breaks all three shields for primary storage.

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