From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kent Overstreet Subject: Re: bcachefs with cache device and backing device Date: Thu, 12 May 2016 20:36:03 -0800 Message-ID: <20160513043603.GA1407@kmo-pixel> References: <573532E2.1040201@gemtalksystems.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pf0-f169.google.com ([209.85.192.169]:34175 "EHLO mail-pf0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750784AbcEMEgH (ORCPT ); Fri, 13 May 2016 00:36:07 -0400 Received: by mail-pf0-f169.google.com with SMTP id y69so37801526pfb.1 for ; Thu, 12 May 2016 21:36:07 -0700 (PDT) Content-Disposition: inline In-Reply-To: <573532E2.1040201@gemtalksystems.com> Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: Martin McClure Cc: linux-bcache@vger.kernel.org On Thu, May 12, 2016 at 06:50:26PM -0700, Martin McClure wrote: > I'm trying out bcachefs for the first time. I can follow the > instructions (format a cache device, mount it type bcache) and it works. > > What I'd like to do, however, is to have an SSD cache device, and a > rotating-disk backing device, as a bcachefs filesystem. Is this > something that bcachefs can do at present? If so, what's the basic > procedure? Yeah - tiering replaces cache/backing devices IIRC, bcache format --tier 0 -C --tier 1 -C (the -C is going to go away at some point)