Hi Chris,
thanks for your valuable hint.
I have now tried with
numjobs=1
iodepth=1
size= entire size of the drive
bs=512 (as this is the block size on a HDD, but 4k gave nearly the same results)
I got (see also below):
randread: 81 IOPS
randwrite: 76 IOPS
Those numbers now match the range that I had expected.
[root@iotest ~]# fio --filename=/dev/sdd --direct=1 --rw=randread --bs=512 --size=500107862016 --runtime=300 --name=file1
file1: (g=0): rw=randread, bs=512-512/512-512, ioengine=sync, iodepth=1
Starting 1 process
Jobs: 1 (f=1): [r] [100.0% done] [41K/0K /s] [81/0 iops] [eta 00m:00s]
file1: (groupid=0, jobs=1): err= 0: pid=16443
read : io=12,435KB, bw=42,443B/s, iops=82, runt=300007msec
clat (msec): min=1, max=22, avg=12.06, stdev= 3.59
bw (KB/s) : min= 36, max= 47, per=99.97%, avg=40.99, stdev= 1.98
cpu : usr=0.07%, sys=0.55%, ctx=24897, majf=0, minf=3208
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 r/w: total=24870/0, short=0/0
lat (msec): 2=0.02%, 4=0.81%, 10=28.56%, 20=69.47%, 50=1.14%
Run status group 0 (all jobs):
READ: io=12,435KB, aggrb=41KB/s, minb=42KB/s, maxb=42KB/s, mint=300007msec, maxt=300007msec
Disk stats (read/write):
sdd: ios=24858/0, merge=0/0, ticks=299591/0, in_queue=299588, util=100.00%
[root@iotest ~]# fio --filename=/dev/sdd --direct=1 --rw=randwrite --bs=512 --size=500107862016 --runtime=300 --name=file1
file1: (g=0): rw=randwrite, bs=512-512/512-512, ioengine=sync, iodepth=1
Starting 1 process
Jobs: 1 (f=1): [w] [100.0% done] [0K/39K /s] [0/76 iops] [eta 00m:00s]
file1: (groupid=0, jobs=1): err= 0: pid=16498
write: io=11,560KB, bw=39,456B/s, iops=77, runt=300001msec
clat (msec): min=1, max=23, avg=12.97, stdev= 3.52
bw (KB/s) : min= 33, max= 43, per=100.14%, avg=38.05, stdev= 1.83
cpu : usr=0.06%, sys=0.53%, ctx=23146, majf=0, minf=2578
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 r/w: total=0/23119, short=0/0
lat (msec): 2=0.01%, 4=0.13%, 10=20.87%, 20=76.63%, 50=2.37%
Run status group 0 (all jobs):
WRITE: io=11,559KB, aggrb=38KB/s, minb=39KB/s, maxb=39KB/s, mint=300001msec, maxt=300001msec
Disk stats (read/write):
sdd: ios=0/23110, merge=0/0, ticks=0/299565, in_queue=299560, util=100.00%
[root@iotest ~]#
best regards,
Werner
PS @Chris: I discovered that your and my last message to you haven't
been sent to the list, now I write directly to the list. My first answer
to you was wrong, I only used 500MB (instead of 500GB) as size.
On Wed, 2010-09-01 at 22:08 -0600, Chris Worley wrote:
> That looks good. You can play with numjobs, ioengines, and iodepths
> (which I believe only applies to libaio) to find a maximum.
>
> A valid seek time average should require numjobs and iodepth set to
> one, and, most importantly, the "size" be the entire drive.
>
> Chris
>
> On Wed, 2010-09-01 at 23:46 +0200, Werner Fischer wrote:
> > Can you give me a hint what fio parameters you would suggest to measure IOPS?
> > Are the 140 IOPS too high for a 7.200k drive like the one I have?
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