From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 419AF7F37 for ; Mon, 14 Dec 2015 10:40:07 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id CC13AAC004 for ; Mon, 14 Dec 2015 08:40:06 -0800 (PST) Received: from sandeen.net (sandeen.net [63.231.237.45]) by cuda.sgi.com with ESMTP id bIbD8rWFo87AP2Kp for ; Mon, 14 Dec 2015 08:39:58 -0800 (PST) Received: from liberator.sandeen.net (liberator.sandeen.net [10.0.0.4]) (using TLSv1.2 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by sandeen.net (Postfix) with ESMTPSA id F16446214D38 for ; Mon, 14 Dec 2015 10:39:57 -0600 (CST) Subject: Re: XFS and nobarrier with SSDs References: <3496214.YTSKClH6pV@merkaba> <566E6524.6070401@xortex.com> <3911767.qVqsL1TcMv@merkaba> <20151214095823.GA30662@infradead.org> <566E978E.2070502@xortex.com> <20151214102750.GA29192@infradead.org> <566E9B36.9080509@xortex.com> From: Eric Sandeen Message-ID: <566EF0DD.8000209@sandeen.net> Date: Mon, 14 Dec 2015 10:39:57 -0600 MIME-Version: 1.0 In-Reply-To: <566E9B36.9080509@xortex.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com On 12/14/15 4:34 AM, Georg Sch=F6nberger wrote: > On 2015-12-14 11:27, Christoph Hellwig wrote: >> On Mon, Dec 14, 2015 at 10:18:54AM +0000, Georg Sch?nberger wrote: >>>> Or to phrase it >>>> differently: If nobarrier makes a difference skipping it is not safe. >>> I do not fully understand that sentence, what do you mean by "makes a >>> difference" and "skipping is not safe"? >> The rule of thumb is: if nobarrier makes your workload run faster you >> should not be using it, aka: don't use it. > OK, thanks for clarification. > Should the XFS FAQ be updated? > *http://xfs.org/index.php/XFS_FAQ#Q._Should_barriers_be_enabled_with_stor= age_which_has_a_persistent_write_cache.3F Yes, it should. I've made some edits, hopefully it's up to date and clear = now. Thanks, -Eric _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs