The following metrics are generally used to describe the performance of a storage device:
IOPS: Read/write count per second. IOPS varies by the underlying drive type of the storage device.
Throughput: Read/written data volume per second, unit in MB/s.
Latency: Time elapsed from sending an I/O operation to receiving an acknowledgement (in seconds).
Yes. For a given resource, the IOPS you get is determined by the I/O size of the read and write operations of the application. Usually, when reading and writing small blocks (for example, I/O size of 256 KB), the IOPS performance of the disk can be fully used.
Yes. For a given resource, the throughput you get is determined by the I/O size of the read and write operations of the application. Usually, when reading and writing large blocks (for example, I/O size of 1MB), the throughput performance of the disk can be fully used.