Strange but during a verify job the output shows that it executed the
verify/read operation first then write:
randw/verify: (groupid=0, jobs=1): err= 0: pid=1647: Tue Feb 14 04:08:08 2017
read : io=10240MB, bw=64801KB/s, iops=63, runt=161816msec
slat (usec): min=48, max=16277, avg=423.53, stdev=2263.87
clat (msec): min=18, max=860, avg=488.46, stdev=34.60
lat (msec): min=18, max=860, avg=488.88, stdev=34.65
clat percentiles (msec):
| 1.00th=[ 461], 5.00th=[ 461], 10.00th=[ 465], 20.00th=[ 478],
| 30.00th=[ 482], 40.00th=[ 482], 50.00th=[ 482], 60.00th=[ 482],
| 70.00th=[ 498], 80.00th=[ 498], 90.00th=[ 498], 95.00th=[ 519],
| 99.00th=[ 619], 99.50th=[ 701], 99.90th=[ 783], 99.95th=[ 824],
| 99.99th=[ 840]
write: io=10240MB, bw=54791KB/s, iops=53, runt=191378msec
slat (usec): min=29, max=16341, avg=548.59, stdev=2596.46
clat (msec): min=17, max=1238, avg=578.37, stdev=61.50
lat (msec): min=17, max=1239, avg=578.92, stdev=61.52
clat percentiles (msec):
| 1.00th=[ 478], 5.00th=[ 502], 10.00th=[ 519], 20.00th=[ 523],
| 30.00th=[ 537], 40.00th=[ 603], 50.00th=[ 603], 60.00th=[ 603],
| 70.00th=[ 603], 80.00th=[ 619], 90.00th=[ 619], 95.00th=[ 627],
| 99.00th=[ 742], 99.50th=[ 873], 99.90th=[ 1057], 99.95th=[ 1106],
| 99.99th=[ 1237]
bw (KB /s): min= 1549, max=69493, per=99.92%, avg=54747.92, stdev=5798.57
lat (msec) : 20=0.01%, 50=0.01%, 100=0.05%, 250=0.12%, 500=48.41%
lat (msec) : 750=50.80%, 1000=0.48%, 2000=0.11%
I used the example from here:
https://github.com/axboe/fio/blob/master/examples/basic-verify.fio
Isn't the results suppose to show the write activity first then the
verify/read?
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