-----Original Message----- From: Jens Axboe [mailto:axboe@xxxxxxxxx] Sent: Sunday, September 28, 2014 3:29 PM To: Hinson, Roger; fio@xxxxxxxxxxxxxxx Subject: Re: Confirming test parameters On 2014-09-28 15:45, Hinson, Roger wrote: > Hey all, > > I'm setting up a test to simulate what we're actually seeing on one of our storage arrays. Can you take a look and provide me some feedback? > > The array usage is for two workload types: > > Type 1: > Random Read % - 45 > Random Write % - 55 > Sequential Read % - 1 > Sequential Write % - 3 > R/W Ratio - 45:55 > Random Block Size - 4K > Sequential Block Size - 64K > > Type 2: > Random Read % - 1 > Random Write % - 13 > Sequential Read % - 2 > Sequential Write % - 84 > R/W Ratio - 3:97 > Random Block Size - 4K > Sequential Block Size - 32K > > I came up with this: > > [global] > group_reporting=1 > thread > iodepth=8 > ioengine=libaio > direct=1 > refill_buffers > randrepeat=1 > randseed=100 > random_distribution=zipf:1.01 > runtime=1200 > time_based > bs_is_seq_rand > > [45read55write_dm0_numjobs_2] > write_bw_log=4555_dm0_2 > write_lat_log=4555_dm0_2 > write_iops_log=4555_dm0_2 > filename=/dev/mapper/mpathq > rw=randrw > rwmixread=45 > rwmixwrite=55 > percentage_random=96 > bs=64K,4K > buffer_compress_percentage=50 > buffer_compress_chunk=512 > numjobs=2 > > [3read97write_dm1_numjobs_2] > write_bw_log=397_dm1_2 > write_lat_log=397_dm1_2 > write_iops_log=397_dm1_2 > filename=/dev/mapper/mpathr > rw=randrw > rwmixread=3 > rwmixwrite=97 > percentage_random=14 > bs=32K,4K > buffer_compress_percentage=50 > buffer_compress_chunk=512 > numjobs=2 This looks like a pretty good approximation. Note that percentage_random can take all data directions into account. So if you have a workload that is: read sequential: 57% write sequential: 95% you could do: percentage_random=43,5 and have that just work. -- Jens Axboe Making sure I understand that. I'm not sure if I have the right percentages. Since I'm using this for my type 2 above: rw=randrw rwmixread=3 rwmixwrite=97 percentage_random=14 Would I list it as percentage_random=1,13 because my read sequential is 2% and write sequential is 84% ? Thanks, Roger -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
