Which command provides a real-time chart of disk statistics by partition?

The command that provides a real-time chart of disk statistics by partition is iostat. This command is part of the sysstat package and serves to monitor system input/output device loading by observing the time the devices are active in relation to their average transfer rates. When executed, iostat generates a report that displays various metrics, including the percentage of CPU time spent on I/O operations and statistics for each disk partition, such as the number of transfers and data transferred over time.

This real-time monitoring capability is particularly useful for administrators looking to identify performance bottlenecks related to disk activity, allowing them to take proactive measures for optimization or troubleshooting.

In contrast, the du command is used for estimating file space usage, df provides information about disk space usage on file systems, and mount is used for mounting file systems. These commands do not focus on providing real-time statistical information about disk operations in the manner that iostat does.