From owner-freebsd-questions@freebsd.org Mon Apr 18 20:07:12 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 74E89B131AA for ; Mon, 18 Apr 2016 20:07:12 +0000 (UTC) (envelope-from shamim.shahriar@gmail.com) Received: from mail-wm0-x22d.google.com (mail-wm0-x22d.google.com [IPv6:2a00:1450:400c:c09::22d]) (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 D2A2C1898 for ; Mon, 18 Apr 2016 20:07:11 +0000 (UTC) (envelope-from shamim.shahriar@gmail.com) Received: by mail-wm0-x22d.google.com with SMTP id a140so135988463wma.0 for ; Mon, 18 Apr 2016 13:07:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-transfer-encoding; bh=/IW4TJ6QgIYT4KSbPkfZhMV7lHIrUj/sb0ng/Grh7Ng=; b=0AQZtC5UW/rYpBbRWigWG2Y8QPXA0baF7UhtW2CsnrZkvcl3xynNZfvedL2gRLPtid 79mviBDfKjZNCsjjoEGEKdjPu1db4HsPFe9o6JlktFRMB5nGtTZcaUJr8CUAJIpeDIuS r/02d85G1q5UiSLtuIodMqcUlWeDnEQ3HPYxFavJ4Jtl6Lp64rOUROGd4l0nctQRXCoY U9X7zwjIHIc//8fAjsr6PpSVL+vrRBBTlQJvgKMfoM7ML3fhXgrlCGApDjrBNfXpr+tG LLIEDEUdiCCAR2yO4xsCh4xgv4Crn30B0t7g1thnGLB1VeU/fDBiNX3KT1ZtnlF+p+i5 0J7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=/IW4TJ6QgIYT4KSbPkfZhMV7lHIrUj/sb0ng/Grh7Ng=; b=StIouvqL8pF0if666FUjAm0yqa4RqEsVxkH5qiH+HutqH9Kqy70yqOEbaA2GyMURIQ ieBnkYavg7/VU/87e6BCP4PhMUhcnVIcQZOT381ISYZg+t5qx055RlLOmLDicLPM1c/L 9RE7Y90eTz9Mj02oiXbeVIZd/W1Nw3e/z4eH17A/lYWpveIp172W9ZmTx37pHDAEV6c7 FjDWrE7I6YTzgvfw+aOpPqLnBt7bXCo1FYiFCJWkDbGgc75I0bRqLkWqf324eMdCGRnA w6SVZKemVaE+cvAN03CfLzrlKOpG4NGnm6JDlwUPfE5RSOlXoUvSqgsqshgu0w4Zs1Pu ti4Q== X-Gm-Message-State: AOPr4FXaWJ0bak9HMom8XRGdQCl7sgMvQx1mExRBuvrTiBmrf83Sk47nPygPdLURrEsfSw== X-Received: by 10.194.19.197 with SMTP id h5mr6814135wje.139.1461010028953; Mon, 18 Apr 2016 13:07:08 -0700 (PDT) Received: from osk.homenet ([2001:470:196e:13:f2de:f1ff:fed1:783c]) by smtp.googlemail.com with ESMTPSA id r10sm53691729wjf.2.2016.04.18.13.07.08 for (version=TLSv1/SSLv3 cipher=OTHER); Mon, 18 Apr 2016 13:07:08 -0700 (PDT) Subject: Re: Raid 1+0 To: freebsd-questions@freebsd.org References: <571533F4.8040406@bananmonarki.se> From: Shamim Shahriar Message-ID: <57153E6B.6090200@gmail.com> Date: Mon, 18 Apr 2016 21:07:07 +0100 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0 MIME-Version: 1.0 In-Reply-To: <571533F4.8040406@bananmonarki.se> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Apr 2016 20:07:12 -0000 On 18/04/2016 20:22, Bernt Hansson wrote: > Hello list > > > Used gstripe to stripe the arrays raid/r0 + r1 into stripe0 > Hi I'm sure there are people with more expertise than I am, and they can confirm either ways. But in my mind, given that you used RAID1 first (mirror) and then used those two RAID1 to create a RAID0, this is logically RAID 1+0. In other words, if you lose one disc from each of the RAID1 you are still safe. If you lose both from one single mirror array (highly unlikely), the stripe is unlikely to be of any use. Hope this helps