From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Pilcher Subject: Re: [RFC] zodcache - auto-start dm-cache devices Date: Fri, 18 Dec 2015 14:50:10 -0600 Message-ID: <56747182.2030404@gmail.com> References: <20151218185110.GA25064@agk-dp.fab.redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20151218185110.GA25064@agk-dp.fab.redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids On 12/18/2015 12:51 PM, Alasdair G Kergon wrote: > Did you try stacking LVM on top of itself first? Honestly, no (although my initial testing of zodcache actually used logical volumes as the origin and cache devices FWIW). This exercise is as much about the "optics" as it is about the actual technical merits of the solution. The goal is provide something that (at least on the surface) looks "simple". With just a couple of obvious enhancements to the mkzc utility (clear the metadata region and start the new device), creating a cached device would literally take just a single command. -- ======================================================================== Ian Pilcher arequipeno@gmail.com -------- "I grew up before Mark Zuckerberg invented friendship" -------- ========================================================================