From owner-freebsd-hackers@FreeBSD.ORG Thu Mar 26 23:29:08 2015 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 7ACC0864; Thu, 26 Mar 2015 23:29:08 +0000 (UTC) Received: from mail-ie0-x235.google.com (mail-ie0-x235.google.com [IPv6:2607:f8b0:4001:c03::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 3BEB2B69; Thu, 26 Mar 2015 23:29:08 +0000 (UTC) Received: by iecvj10 with SMTP id vj10so59214619iec.0; Thu, 26 Mar 2015 16:29:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=HDF8/2oDa15/2vebzs7AHvKcC8IcTLkV5794DTJ4XCY=; b=q8/IFJr1x/OYT6E3wsy8p/0lBAA7+RVHLz8bckqEqLjfIaTeLC8eK75MjLMS4i6OF4 vZepz7MzcxG0yLt/JU7amBUdPSyfczohK1Fqjbqp4UYYm0vmaGXSrIcwZ3Cb8eTMmLAE hsSFBdsk8lq4Non5XpPiOZAsPiUrCRgyYxIQPgS1IAg5KXPz9T8hapm218lDkX4ieyx2 AON6hVHi7RUsd7wHg1YM3+XuUGnpx199SK2kD2n/hFXstxuBW2M8UMIPJLcUYgv3EW5k AnHbYD2DXsp7EyM8fafrNzInd8y91mXzi9hJsnuOtCxl9/8JH6/gIICdJKAhqPBqz+5k Fqog== MIME-Version: 1.0 X-Received: by 10.107.5.131 with SMTP id 125mr24381043iof.88.1427412547500; Thu, 26 Mar 2015 16:29:07 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.36.17.194 with HTTP; Thu, 26 Mar 2015 16:29:07 -0700 (PDT) In-Reply-To: References: Date: Thu, 26 Mar 2015 16:29:07 -0700 X-Google-Sender-Auth: QnjXo_ZE-i1CUgvTuKMsXB2VeJM Message-ID: Subject: Re: Seagate Archive HDD From: Adrian Chadd To: Alan Somers Content-Type: text/plain; charset=UTF-8 Cc: "freebsd-hackers@freebsd.org" , Wojciech Puchar X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Mar 2015 23:29:08 -0000 On 26 March 2015 at 15:37, Alan Somers wrote: > On Thu, Mar 26, 2015 at 4:33 PM, Adrian Chadd wrote: >> Hm, what's required to get the stripe size for doing IO or whatever >> the under-the-hood thing is for the Sharding? >> >> -a > > My understanding is that it's impossible; the drive-managed SMR drives > present themselves as ordinary disks. But, if their design is similar > to the upcoming host-aware SMR drives, then the band size will be on > the order of a few hundred megabytes. Does anyone have anything that we can expose to userland / GEOM? There's a bunch of useful userland storage stuff that would benefit from knowing this kind of thing. -adrian