From: Jens Axboe <axboe@kernel.dk>
To: "Strickland, Carl" <carl.strickland@intel.com>
Cc: "fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: FIO r/w to 2 disks
Date: Fri, 15 Jun 2012 08:49:48 +0200 [thread overview]
Message-ID: <4FDADB0C.5040308@kernel.dk> (raw)
In-Reply-To: <4E57E183169EA04186759995F13BDC6234F46FA9@FMSMSX103.amr.corp.intel.com>
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
next prev parent reply other threads:[~2012-06-15 6:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-08 19:52 FIO r/w to 2 disks Strickland, Carl
2012-06-14 7:54 ` Jens Axboe
2012-06-14 23:41 ` Strickland, Carl
2012-06-15 6:49 ` Jens Axboe [this message]
2012-06-18 15:48 ` Strickland, Carl
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