Feature Request: Add disk read and write wait times for disk collection data

[MrPippin66]

Frequently, we'll see issues that are specific to differences in write times vs read times, and 'sar' data only provides a cumulative time for both read and write.

Linux and other OSes provide the read and write response times in addition to the cumulative times.

It would very beneficial if 'sar' data included this data as well.

I don't show any pending feature request of the same kind from what I could fine.

In the specific case of Linux, the data is provided in /proc/diskstats as:

Column Description 7 time spent reading (ms) 11 time spent writing (ms)

[MrPippin66]

Is this under review?

[sysstat]

Hi, I have no plan to add this feature to sar for now. iostat already makes this distinction between read and write times.

[MrPippin66]

I understand that "iostat" provides this. The issue is this distinction in missing in the historical data for 'sar', which makes diagnosing issues that occured in the past difficult that need this distinction.

In enterprise environments, the difference between read and write performance can vary significantly. The average of the two that 'sar' provides hides this from historical examination.