
472 DS8800 Performance Monitoring and Tuning
Low tps value, low %user value, high %iowait value, high service time, high read queue,
and high write queue: High write large block activity exists on the same disks that are also
intended for read activity. Split the data for writes and reads on the separate disks.
These situations are examples for your understanding. Plenty of similar situations might
occur. Remember to analyze not one or two values of the collected data, but try to obtain a full
picture by combining all the available data.
Monitoring workload distribution on the paths
As shown in Example 12-7 on page 463, disks dm-0 and dm-1 ha ...