I want to know disk read / write utilization especially, only read or write utilization or write utilization I tried using iostat but it shows entire utilization,
How to check only disk read or only write utilization (The progress is consist of read + write works)
Perhaps iotop
is the right tool for you.
On the left you can see which process causes how much load and the hdparm
test I ran in the session on the right is clearly shown there.