From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.virtall.com ([178.63.195.102]:42051 "EHLO mail.virtall.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753939AbaHEXj0 (ORCPT ); Tue, 5 Aug 2014 19:39:26 -0400 To: "G. Richard Bellamy" Subject: Re: btrfs and iostat - how do I measure the live performance of my btrsf =?UTF-8?Q?filesystems=3F?= MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Date: Wed, 06 Aug 2014 01:39:22 +0200 From: Tomasz Chmielewski Cc: linux-btrfs In-Reply-To: References: Message-ID: <40ee87d5d8b24230774bf28018ceb289@admin.virtall.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 2014-08-06 00:06, G. Richard Bellamy wrote: > On Tue, Aug 5, 2014 at 7:14 AM, Tomasz Chmielewski > wrote: >> Simple iostat won't give you meaningful live performance stats. >> >> You can combine it i.e. like below: >> >> iostat -x 1 >> iostat -mx 1 >> iostat -m 1 > > Thanks for the pointer about viewing the extended stats, and showing > them in MB rather than kB. > > Maybe I'm missing something here. I'm failing to see how adding those > additional stats helps me get meaningful throughput information for a > multi-device btrfs volume. Well you won't see an aggregate, but you will see individual device statistics with "1" at the end of iostat arguments (meaning, dump the stats every second). -- Tomasz Chmielewski http://www.sslrack.com