Hello, I am trying to get a better understanding of the disk io metrics below.
Included are the definitions for each per the Elastic documentation online.
system.diskio.read.time - total number of milliseconds spent by all reads
system.diskio.write.time - total number of milliseconds spent by all writes
system.diskio.iostat.await - average time spent for requests issued to the device to be served
system.diskio.iostat.service_time - average service time (in milliseconds) for I/O requests that were issued to the device
Q1: Is system.diskio.io.time equal to the average of system.diskio.read.time and system.diskio.write.time for a given time interval on a given device?
Q2: How does system.diskio.io.time relate to system.diskio.iostat.await?
Q3: Which metric is best to use to represent overall disk latencies - both reads and writes?