On 2011-06-01 16:33, Troels Arvin wrote: > Hello, > > Jens Axboe wrote: >> The iometer like test >> case you are using is meant to be used on a raw block device, not on a >> file system. > > OK, but how does one use fio with a raw device? Can you give an example of a job specification file for working with a raw block device? To take your example: [global] bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10 rw=randrw rwmixread=70 direct=1 size=10g ioengine=libaio iodepth=256 write_bw_log write_lat_log numjobs=6 [sda] filename=/dev/sda would run the workload in question directly on the raw sda device. > And can that be done in a way which simulates parallel I/O (several > processes/threads working simultaneously)? For the above example, you have 6 processes doing random read/write patterns with the 70/30 read/write mix and with the block sizes given. -- 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
