Which statement is NOT true about distributed storage?

• A. Supports large-scale horizontal expansion.
• B. Supports expansion by addition of nodes to increase both computing capability and storage space.
• C. Does not support elastic EC for data redundancy protection.
• D. Supports storage resource pooling and virtualization.

Answer: (C)

In distributed storage, redundancy and scalability are designed to adapt as the system grows. Data is spread across many nodes, enabling large-scale horizontal expansion, and adding nodes increases both capacity and computing power. The architecture also pools storage resources and provides virtualization to present a unified view of the storage.

A central capability is erasure coding for data protection, which uses data and parity chunks to recover from failures with less overhead than full replication. Importantly, elastic erasure coding means the system can adjust the coding scheme and re-balance data as nodes are added or removed, maintaining fault tolerance while scaling efficiently. Therefore, the statement that elastic EC is not supported isn't true; distributed storage typically supports elastic EC to adapt redundancy with the cluster. The other statements correctly describe distributed storage features: horizontal expansion, growth in compute and storage with new nodes, and resource pooling with virtualization.