Which metric measures the number of read operations performed on a disk?

The metric that measures the number of read operations performed on a disk is DiskReadOps. This metric specifically tracks how many times data is read from the disk, which is crucial for understanding the performance and load on a storage system. Monitoring DiskReadOps can help identify whether the storage subsystem is experiencing heavy read workloads, which can inform decisions on scaling resources or optimizing performance.

DiskWriteOps, in contrast, refers to write operations, measuring how many times data is written to the disk. DiskThroughput measures the speed of data transfer, typically in terms of megabytes per second (MB/s), while DiskUsage indicates the total capacity used on the disk, but does not provide insights into operational metrics like read or write counts. Hence, DiskReadOps is the most appropriate choice for measuring read operations specifically.