From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <54F4BD49.9040806@kernel.dk> Date: Mon, 02 Mar 2015 12:43:05 -0700 From: Jens Axboe MIME-Version: 1.0 Subject: Re: diskutil output explained References: In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit To: Georgios Koloventzos , fio@vger.kernel.org List-ID: On 02/27/2015 06:19 PM, Georgios Koloventzos wrote: > Hello, > > I am running fio to test some virtual machines of mine and I am having some > difficulties. > So my question as it is written on the subject. > What exactly are the output of the --debug=diskutil command? > I have seen the code of diskutil.c but I will like a bit more > explanatory answer. As the option hints at, it's just debug output. Mostly deals with how it resolves md/dm devices to the underlying devices, and so forth. So not sure there's that much interesting there to you, unless you are trying to debug a problem with it. In general, fio figures out what devices to monitor, and then continually opens the stat files and collects the appropriate information every 250msecs. -- Jens Axboe