These are one of the 4K write results to disk vdb (lvm volume on SSD which is irrelevent for present discussion).
“The average time (in milliseconds) for I/O requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them
Wait_Time-vdb-write=0.042727
Throughput :
Throughput-vdb-write=65.902727
“svctm – The average service time (in milliseconds) for I/O requests that were issued to the device.
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util vda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 vdb 0.00 0.00 49409.00 0.00 193.00 0.00 8.00 7.04 0.14 0.14 0.00 0.02 100.00
Disk Utilization
Utilization-vdb=74.195455
Frame size; 4K
0.0427 ms = 42.7 microseconds. 42.7 microseconds per request
Throughput is 65 MB/s so 65 * 1024 / 4
= 16640 requests/s
1000000 microseconds/s / 16640 requests/s = 60 ms/request
60 ms/request * 0.75% disk utilization = 45 microseconds/request
So Time spend on each IO request is 45 microseconds/request
Thanks to Stefan