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Disk Performance iostat

Use iostat to get the performance data
# iostat -x

Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.48 2.76 1.90 0.92 56.44 29.40 30.53 0.01 4.48 2.46 0.69

Work out the queue length
requests * average wait time / 1000 = queue length
((1.90+0.92) * 4.48) / 1000 = 0.01

Calculate the throughput
reads and writes * sector size
(56.44+29.40) * 512 / 1024 = 43Ki

Calculate utilization
requests * service time / 1000 * 100 = utilization
(1.90+0.92) * 2.46 / 1000 * 100 = 0.69

Determine peak arrival rate
1/service time * 1000
(1/2.46 )*1000 = 406.5

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