On Mon, Feb 04 2013, Neto, Antonio Jose Rodrigues wrote: > Hi All, > > This is neto from Brazil > > How are you? > > I am doing a performance POC and I need to simulate 100% true random workload. I am using Fibre Channel and Windows 2008R2. > > I have 8 LUNs (125GB each) and my configuration file is: > > [workload] > bs=8k > ioengine=windowsaio > iodepth=3 > numjobs=35 > direct=1 > runtime=120 > size=1024g > filename=\\.\PhysicalDrive1 > filename=\\.\PhysicalDrive2 > filename=\\.\PhysicalDrive3 > filename=\\.\PhysicalDrive4 > filename=\\.\PhysicalDrive5 > filename=\\.\PhysicalDrive6 > filename=\\.\PhysicalDrive7 > filename=\\.\PhysicalDrive8 > zonesize=1024m > zoneskip=3g > rw=randrw > rwmixread=80 > rwmixwrite=20 > thread > unified_rw_reporting=1 > group_reporting=1 > randrepeat=0 > norandommap > > Questions: > > 1) I am assuming the working set is the size parameter that is 1TB. Is > that correct? Correct > 2) What is the correlaction of the zonesize and zoneskip with the > randomness? Adding those will help with the randomness of the workload > or not? Your setting of zonesize=1g, skip=3g, will do random read/write within a 1gb zone (so from 0-1G initially), then move to the next zone (3G-4G), etc. For a rotating drive, this will mean shorter seeks, since while it is doing one zone, it will only seek within that zone. > 3) If I use zonesize=1024m and zoneskip=3g I have like 100K IOPS > (coming from cache not disks) and if I use zonesize=10g and > zoneskip=26g I have more realistic numbers. Could someone explain > which is the a good example to use zonesize and zoneskip? Depends on what you want, really. With zonesize=10g, you are now seeking in a 10x wider area than you were before. > 4) Is it possible with fio to specify per disk randomness area: For > example: disk1 - start blocks 456 till blocks 3456, disk2 - start > blocks 4567 to 103456 You'd have to use different jobs. You above example uses 8 disks and accesses them from all 35 jobs. You could split it a bit, so that you have 8 sections, each accessing one disk. You could have 4 jobs in each section, giving you a total of 32 jobs. Then you can set offset/size for each job separately. -- Jens Axboe -- 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
