From owner-freebsd-fs@FreeBSD.ORG Tue Mar 24 18:42:57 2015 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E432C5E0; Tue, 24 Mar 2015 18:42:57 +0000 (UTC) Received: from mail-la0-x22f.google.com (mail-la0-x22f.google.com [IPv6:2a00:1450:4010:c03::22f]) (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 5FE593E9; Tue, 24 Mar 2015 18:42:57 +0000 (UTC) Received: by labto5 with SMTP id to5so1506144lab.0; Tue, 24 Mar 2015 11:42:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=TY0C2Xx0HM1qbvMwUs+jukvesqds5EE0yq931hz4dsQ=; b=LyEfDLNn+Cx96/GF+z9l43w/EtQQRZvPqYlJZ0GVwO88Dz/s7XwfTpN+cIbPGoWOmr RLclw9LOiqrzwX+w5uPnzvSW/z0fy8BXsBzxA7KKUUwKdOCoBPbwWJtZ5vNopmH2KAnU 0FfEhZedZuR5SwKePJxjLQqo2k2DMOS1s/+uaMHsPAjMdaKQi/9/yNimYmRC2MbpYF8x P1Y1bmfz0GMFjyZJoNAtMVyaUI2LbIs/DUpiMlLu+yW4uzQ8Syx7MtjsIzTyvZRyS7tp kU9f2w2tZ0clVrVHyNG9GwfBxtHTb1icOko8wFB4g1fVGO50Zub3aAcaM+9og41gm+1J shUA== MIME-Version: 1.0 X-Received: by 10.112.85.10 with SMTP id d10mr2572926lbz.62.1427222575349; Tue, 24 Mar 2015 11:42:55 -0700 (PDT) Received: by 10.25.24.161 with HTTP; Tue, 24 Mar 2015 11:42:55 -0700 (PDT) In-Reply-To: <9C91F97841BC4347910F206618BAA3BB096D453FB6@PAIMAIL.pai.local> References: <02F3A553C174554DA1D5EC7CEE9BDDD7011BC3E42B@loki.lvc.com> <5511A204.7020705@internetx.com> <9C91F97841BC4347910F206618BAA3BB096D453FB6@PAIMAIL.pai.local> Date: Wed, 25 Mar 2015 00:12:55 +0530 Message-ID: Subject: Re: Zoned Commands ZBC/ZAC, Shingled SMR drives, ZFS From: Shehbaz Jaffer To: Michael Jung Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 Cc: FreeBSD FS , "freebsd-hardware@freebsd.org" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Mar 2015 18:42:58 -0000 > 'host aware' or 'host managed' SMR drives open the real possibilities for use under ZFS and other file systems. Agreed. Probably RAID is not the way to go then. In host managed SMR drives one could use other form of resiliency (Erasure Codes) rather than RAID. We do not rebuild the whole disk but probably just a zone of a SMR drive in case of errors.