Which command can be used to perform simple disk latency tests?

The command used to perform simple disk latency tests is ioping. This tool is specifically designed to measure and report the latency of storage devices, such as hard drives or SSDs. It works similarly to the ping command for network diagnostics, but instead of measuring network latency, ioping measures how long it takes to read data from a storage device.

Using ioping, users can test read and write speeds on block devices, providing insights into the performance characteristics of the storage medium. This makes it a valuable tool for system administrators and those working in performance tuning or troubleshooting storage-related issues.

The other commands listed serve different purposes. For instance, lsmod displays the status of loaded modules in the Linux kernel, and modprobe is used to add and remove modules from the kernel. Uptime provides information about how long the system has been running along with the load average, but it does not provide any disk performance information. Therefore, ioping is uniquely suited for the specific task of measuring disk latency.