From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vojtech Pavlik Subject: Re: Btrfs on bcache device: mount options? Date: Thu, 15 Oct 2015 16:29:45 +0200 Message-ID: <20151015142945.GA10162@suse.com> References: <87mvvk4718.fsf@gmx.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from jablonecka.jablonka.cz ([91.219.244.36]:50134 "EHLO jablonecka.jablonka.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751914AbbJOOzA (ORCPT ); Thu, 15 Oct 2015 10:55:00 -0400 Content-Disposition: inline In-Reply-To: <87mvvk4718.fsf@gmx.de> Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: Simon Herter Cc: linux-bcache@vger.kernel.org On Thu, Oct 15, 2015 at 03:04:35PM +0200, Simon Herter wrote: > I'm using btrfs on a bcache device and I'm a bit confused about mount > options. For example, bcache may (if I understood correctly) bypass the > cache completely for sequential access. So should I use "ssd" mount > option or not? Are there any general recommendations? No, you should not. It modifies the data layout behavior to ignore seek times. These may be present when reading from the backing media. You likely want to enable compression and autodefragmentation, too. -- Vojtech Pavlik Director SUSE Labs