Hey,
Im currently working on a bachelor thesis where I need to measure iops
on my storage solution.
I have set up a "frontend" server(ubuntu server 13.10) which has zfs on
linux running, and is connected to an iSCSI RAID(SAN).
When I use this command:
fio --directory=/pool --size=128M --direct=0 --fallocate=none
--rw=randrw --refill_buffers --norandommap --randrepeat=0
--ioengine=sync --bs=4k --rwmixread=100 --iodepth=16 --numjobs=16
--runtime=60 --group_reporting --name=4krandreadtest
I get:
4krandreadtest: (groupid=0, jobs=16): err= 0: pid=4101
read : io=2048.0MB, bw=2158.7MB/s, iops=552463 , runt= 949msec
clat (usec): min=4 , max=23125 , avg=26.15, stdev=346.02
lat (usec): min=4 , max=23125 , avg=26.28, stdev=346.07
clat percentiles (usec):
| 1.00th=[ 5], 5.00th=[ 5], 10.00th=[ 6], 20.00th=[ 8],
| 30.00th=[ 9], 40.00th=[ 9], 50.00th=[ 9], 60.00th=[ 10],
| 70.00th=[ 11], 80.00th=[ 12], 90.00th=[ 16], 95.00th=[ 19],
| 99.00th=[ 35], 99.50th=[ 133], 99.90th=[ 5664], 99.95th=[ 8160],
| 99.99th=[14528]
bw (KB/s) : min=114424, max=159840, per=6.09%, avg=134474.12,
stdev=13435.6
7
lat (usec) : 10=51.38%, 20=44.19%, 50=3.71%, 100=0.15%, 250=0.19%
lat (usec) : 500=0.06%, 750=0.03%, 1000=0.02%
lat (msec) : 2=0.05%, 4=0.08%, 10=0.12%, 20=0.03%, 50=0.01%
cpu : usr=5.76%, sys=37.95%, ctx=5049, majf=0, minf=409
IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
read : io=2048.0MB, bw=2158.7MB/s, iops=552463 , runt= 949msec
clat (usec): min=4 , max=23125 , avg=26.15, stdev=346.02
lat (usec): min=4 , max=23125 , avg=26.28, stdev=346.07
clat percentiles (usec):
| 1.00th=[ 5], 5.00th=[ 5], 10.00th=[ 6], 20.00th=[ 8],
| 30.00th=[ 9], 40.00th=[ 9], 50.00th=[ 9], 60.00th=[ 10],
| 70.00th=[ 11], 80.00th=[ 12], 90.00th=[ 16], 95.00th=[ 19],
| 99.00th=[ 35], 99.50th=[ 133], 99.90th=[ 5664], 99.95th=[ 8160],
| 99.99th=[14528]
bw (KB/s) : min=114424, max=159840, per=6.09%, avg=134474.12,
stdev=13435.6
7
lat (usec) : 10=51.38%, 20=44.19%, 50=3.71%, 100=0.15%, 250=0.19%
lat (usec) : 500=0.06%, 750=0.03%, 1000=0.02%
lat (msec) : 2=0.05%, 4=0.08%, 10=0.12%, 20=0.03%, 50=0.01%
cpu : usr=5.76%, sys=37.95%, ctx=5049, majf=0, minf=409
IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%,
>=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%,
>=64=0.0%
issued : total=r=524288/w=0/d=0, short=r=0/w=0/d=0
Run status group 0 (all jobs):
READ: io=2048.0MB, aggrb=2158.7MB/s, minb=2158.7MB/s,
maxb=2158.7MB/s, mint=9
49msec, maxt=949msec
These values are extremly high and I suspect that these are the RAM
speed being returned to me.
Is there anyway to get a more realistic result?
Thanks in advance,
Kim Holmebakken
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