From owner-freebsd-questions@FreeBSD.ORG Thu May 28 16:16:57 2015 Return-Path: Delivered-To: freebsd-questions@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 DE70F348 for ; Thu, 28 May 2015 16:16:57 +0000 (UTC) (envelope-from merlyn@stonehenge.com) Received: from out-004.lax.mailroute.net (004.lax.mailroute.net [199.89.1.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "*.mailroute.net", Issuer "AlphaSSL CA - SHA256 - G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id BE7751DC for ; Thu, 28 May 2015 16:16:56 +0000 (UTC) (envelope-from merlyn@stonehenge.com) Received: from localhost (localhost.localdomain [127.0.0.1]) by out-004.lax.mailroute.net (Postfix) with ESMTP id 3lyDbY5rjhz15JtD; Thu, 28 May 2015 16:13:29 +0000 (UTC) X-Virus-Scanned: by MailRoute Received: from out-004.lax.mailroute.net ([199.89.1.7]) by localhost (004.lax.mailroute.net [127.0.0.1]) (mroute_mailscanner, port 10026) with LMTP id ogviNUQjoZzp; Thu, 28 May 2015 16:13:28 +0000 (UTC) Received: from red.stonehenge.com (red.stonehenge.com [208.79.95.2]) by out-004.lax.mailroute.net (Postfix) with ESMTP id 3lyDbX67Lyz15Jmg; Thu, 28 May 2015 16:13:28 +0000 (UTC) Received: by red.stonehenge.com (Postfix, from userid 1001) id 8A03C16FF; Thu, 28 May 2015 09:13:19 -0700 (PDT) From: merlyn@stonehenge.com (Randal L. Schwartz) To: kpneal@pobox.com Cc: krad , Baho Utot , FreeBSD Questions , Jon Radel Subject: Re: FreeBSD 10.1 + ZFS References: <20150526034748.GA1674@WorkBox.Home> <5564E1CE.2040700@columbus.rr.com> <5564E6F5.1090306@radel.com> <5564EF07.2080603@columbus.rr.com> <20150527000713.GA3257@WorkBox.Home> <55661AA5.9030403@columbus.rr.com> <55662C35.4000802@radel.com> <20150528141312.GA54499@neutralgood.org> x-mayan-date: Long count = 13.0.2.8.8; tzolkin = 8 Lamat; haab = 16 Zip Date: Thu, 28 May 2015 09:13:19 -0700 In-Reply-To: <20150528141312.GA54499@neutralgood.org> (kpneal@pobox.com's message of "Thu, 28 May 2015 10:13:12 -0400") Message-ID: <86y4k8adeo.fsf@red.stonehenge.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 May 2015 16:16:58 -0000 >>>>> "kpneal" == kpneal writes: kpneal> So, yes, a three-way mirror will perform better than a 3-drive kpneal> RAIDz2. But doesn't that create a write-hole? Or are the mirrors atomically updated, and the system on a restart after a crash can determine by chronology which one or two drives contains the latest data? -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 Perl/Unix consulting, Technical writing, Comedy, etc. etc. Still trying to think of something clever for the fourth line of this .sig