 |
| image source: https://www.dnsstuff.com/latency-throughput-bandwidth |
File system performance is measured by:
- Latency
- delay between request and response
- a measure of the length of time it takes for a single I/O request to be completed from the application's point of view
- measured separately for read (usually in microseconds) and write (usually in milliseconds) operations
- If the I/O is a data read, latency is the time it takes for the data to come back. If the I/O is a write, latency is the time for the write acknowledgement to return.
- affects application's acceleration
- Throughput / Bandwidth
- measures how many units of information a system can process in a period of time
- describes the amount of data able to flow through a point in the data path over a given time
- throughput and latency are often competing goals - the lower the latency, the higher the throughput
- measured separately for file system read (usually in GiBps) and file system write (usually in MiBps) operations
- typically the best storage metric when measuring data that needs to be streamed rapidly, such as images and video files.
- Input/Output operations per second (IOPS)
- number of I/O operations per second
- measured separately for read and write operations
- as the number of IOPS requested from the device increases the latency will increase
- affects application's scalability
No comments:
Post a Comment