From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id F1F027F37 for ; Mon, 14 Dec 2015 03:58:35 -0600 (CST) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay1.corp.sgi.com (Postfix) with ESMTP id D33A58F8033 for ; Mon, 14 Dec 2015 01:58:32 -0800 (PST) Received: from bombadil.infradead.org ([198.137.202.9]) by cuda.sgi.com with ESMTP id 2v8Sj7rH14bCQdQE (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Mon, 14 Dec 2015 01:58:30 -0800 (PST) Date: Mon, 14 Dec 2015 01:58:23 -0800 From: Christoph Hellwig Subject: Re: XFS and nobarrier with SSDs Message-ID: <20151214095823.GA30662@infradead.org> References: <3496214.YTSKClH6pV@merkaba> <566E6524.6070401@xortex.com> <3911767.qVqsL1TcMv@merkaba> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <3911767.qVqsL1TcMv@merkaba> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Martin Steigerwald Cc: Jens Axboe , Georg Sch?nberger , XFS mailing list , Linux Block mailing list , Jeff Moyer , Linux FS-Devel On Mon, Dec 14, 2015 at 09:38:56AM +0100, Martin Steigerwald wrote: > Is it safe to use XFS (or any other filesystem) on enterprise SSDs with Power > Loss Protection (PLP), i.e. some capacitor to provide for enough electricity > to write out all data in DRAM to flash after a power loss, with a reordering > I/O scheduler like CFQ? If the device does not need cache flushes it should not report requiring flushes, in which case nobarrier will be a noop. Or to phrase it differently: If nobarrier makes a difference skipping it is not safe. _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs