In storage systems, what does throughput refers to?

In the context of storage systems, throughput, often referred to as bandwidth, is a key performance indicator that measures the rate of data transfer. It quantifies the amount of data that a storage system can read from or write to its storage media (like HDDs or SSDs) within a specific unit of time. This metric is typically expressed in megabytes per second (MB/s) or gigabytes per second (GB/s) and is particularly critical for applications involving large, sequential data transfers, such as video editing, backups, and big data analytics.

B. This defines network throughput, which measures data transfer over a network, a separate component that can be a bottleneck but is not the storage system's intrinsic throughput.
C. This describes the signaling rate of a processor or bus, which is related to CPU performance or internal data pathways, not the storage medium's data transfer capability.
D. This refers to computational performance, typically measured in FLOPS (Floating-Point Operations Per Second), which quantifies a processor's calculation speed, not data storage I/O.

1. Huawei Certified ICT Associate - Storage (H13-611) V5.0 Training Material. In the module covering "Storage System Components and Mainstream Products," key performance indicators are defined. Throughput (or bandwidth) is explicitly described as the data transfer rate, representing the volume of data written to or read from the storage medium per unit of time. (Refer to HCIA-Storage V5.0 Training Material, Chapter 1: "Overview of Storage Technology Development", Section on "Key Storage Performance Indicators").

2. Patterson, D. A., & Hennessy, J. L. (2017). Computer Organization and Design: The Hardware/Software Interface (5th ed.). Morgan Kaufmann. In Chapter 6, "Storage and Other I/O Topics," I/O performance metrics are discussed. Throughput (or bandwidth) is defined as the measure of the amount of data that can be moved between the storage device and memory in a given period, which aligns directly with option A. (See Section 6.4, "Measuring I/O Performance").

3. Huawei. (2020). OceanStor Dorado All-Flash Storage Systems V6 Product Documentation. Technical specifications and performance white papers for Huawei storage systems consistently define throughput as the maximum data transfer rate (in GB/s) for sequential read/write operations, measuring the system's capability to move data to and from the physical storage media. (Refer to performance testing sections in official product white papers).