On 07/02/2014 01:42 PM, Yuyang (Alex) Wang wrote: > hi all, > > I am using FIO (2.1.7) to profile block level performance of multiple > RAID devices. (see config file below). The test is done on a capable > 16-core server. With a sigle raid device, I am getting roughly > 1.4GB/s, with two devices in place, I am still getting around 1.4GB/s, > which is weird. Another in-house developed benchmark tool, running > SINGLE-thread suggested we can almost double. I could get double the > performance through FIO by configuring two jobs, with each job > handling one device only. However, it still puzzles me as to why a > single process FIO can't drive the performance of two devices. Did I > do anything wrong as to the configure file? > > Thanks > > Alex. > > > [globals] > > rw=write > ioengine=libaio > iodepth=16 > direct=1 > blocksize=1m > runtime=30 > > [devices] > filename=/dev/mapper/raid-0 > filename=/dev/mapper/raid-1 You are overwriting filename here, hence running with just one device. -- 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
