Thanks Jens, I will look into it! Cheers, Carl Strickland -----Original Message----- From: fio-owner@xxxxxxxxxxxxxxx [mailto:fio-owner@xxxxxxxxxxxxxxx] On Behalf Of Jens Axboe Sent: Thursday, June 14, 2012 11:50 PM To: Strickland, Carl Cc: fio@xxxxxxxxxxxxxxx Subject: Re: FIO r/w to 2 disks On 06/15/2012 01:41 AM, Strickland, Carl wrote: > Hi Jens, > > The test I'm interested in performing would require (I believe) FIO to > read from one device and write to another in a specified ratio. This > is different from the rwmix feature in FIO, as I can specify only a > single device where the reads and writes will take place. > > Assuming that I could achieve the same read/write ratio with two FIO > instances (one reading from one device and the other writing to a > different device) as I get using a single FIO instance and rwmix, is > there a reason--in terms of how reads and writes would be > performed--that would prevent a valid comparison between the two? Maybe the flow options would help you? Set up two jobs in a single file, one reader and one writer. Set up the flow parameters to get your desired split. See HOWTO, and/or examples/flow to get an idea for how to use that. -- 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 -- 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
