From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: [GSoC2016] BlueStore SMR Support Date: Mon, 14 Mar 2016 09:22:10 -0400 Message-ID: <56E6BB02.6030801@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com ([209.132.183.28]:51221 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934370AbcCNNWM (ORCPT ); Mon, 14 Mar 2016 09:22:12 -0400 In-Reply-To: Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Giridhar Yasa , Sage Weil Cc: Shehbaz Jaffer , ceph-devel@vger.kernel.org On 03/14/2016 08:33 AM, Giridhar Yasa wrote: > On Mon, Mar 14, 2016 at 5:47 PM, Sage Weil wrote: >> On Sun, 13 Mar 2016, Giridhar Yasa wrote: >>> On Fri, Mar 11, 2016 at 8:20 PM, Sage Weil wrote: >>>> On Fri, 4 Mar 2016, Shehbaz Jaffer wrote: >>>> >>>>> 2) Will scope of project be to build an allocator on a simulator for >>>>> SMR Drives? Or will I get actual HDDs to work with? In case of >>>>> simulators, will the project involve building a simulator on disksim? >>>> I seem to remember hearing something about a dm module that simulated SMR, >>>> but I'm not sure. We may also be able to get some SMR disks to play >>>> with--I'll reach out to our drive vendor friends. >>> Would that be https://github.com/hgst/libzbc from HGST? >> Yes. >> >> I'm not sure about a disk simulator or actual drive availability, >> though. > libzbc has an emulation mode that can use files or block devices to > emulate SMR disk zones. > > Giridhar > Just keep in mind that different vendors have different behaviors - you will need to tweak it I assume to make it act like the drive you are interested in. Regards, Ric