Thanks Jens. I was using refill_buffers and scramble_buffers at the same time. If i specify them at the same time, there seems to be no difference in the workloads. If i specify scramble_buffers then there shouldn't be refill_buffers specified to get the buffers differently. Thanks. Srinivasa R Chamarthy On Tue, May 5, 2015 at 4:39 AM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 04/25/2015 07:03 AM, Srinivasa Chamarthy wrote: >> >> Firstly, thanks before in hand. :) >> >> Using FIO, what is the way to achieve a work load with specific number >> of unique blocks duplicates for specific number of times. For Example, >> i want a 252k block duplicates 1000 times and i want it to be the >> unique block in the complete workload. > > > If you have very specific requirements, it might be easier to simply write > an iolog generator that spits out what you want the pattern to look like. > Then fio can import that, and run the workload. > >> Another query is that, for a blocksize of 256k does the io buffers are >> created at 256k and written to the disk and are all those 256k blocks >> unique buffer?. Can there be a change that in a 256k block, the >> smaller size buffers be the same? > > > That depends on the settings for compressibility, dedupability, etc. In > general see scramble_buffers, refill_buffers, and so on. That is all in the > man page or HOWTO. > > -- > 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
