From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BC6AF197 for ; Wed, 12 Jun 2024 00:14:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718151277; cv=none; b=YactxrYHq0qE+YO9byQaeeskTXyTfisZWiyFfdXPasYefJ/WRVSfSJtZ8liWEZL7c3KkNKq7RvNEB8K9Xr7CM5Yqv7wTL4r+YeFvhV0Vxr1hPjiLMj57nXw5XBYKcRLr1b/qcniV/op8OfN2VIYLPW5zJCtii1vJB07cM+JCUW0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718151277; c=relaxed/simple; bh=+g1rumkFv0HoMyxli7qWEBDzssyvW8XU8YWDd/QHgwE=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=aJk6LnvNX0oJfh9Dfu9GQNmzZHAqIR4Nc56gXz44683rA2jIB+hz3S/4UvnGQXbznZ8LJni0PivoAO7gCchhRRMDlgJDb5VpQOWoV6yTyMn1A7rdF4+qvvk/y4gp31dslIWqLxv3uDFQ2HlDEkIyyHlsKdibVCVCku2zS2SywxI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=A2k9W4fi; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="A2k9W4fi" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1718151276; x=1749687276; h=date:from:to:cc:subject:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=+g1rumkFv0HoMyxli7qWEBDzssyvW8XU8YWDd/QHgwE=; b=A2k9W4fiR/EBjQxs0pNijYct6xABRaUW7NkUdGDGq7goKy2yFWHYhA5Q j37a2NslPnSuUi2stnKzr/BdHz8EqkJ+ZdHl9QNAke8kYhIlaivRsL9ab xsCJVAybq6opfyqz+B8MeFhSMX7W6ipmjQVV1NlB1zDdjNk++zBvVV6FB CImqOJM3lVYZGG14zm1OxHxaoNNoUeUJKGWzY4MQxBMVr+/Yf1MHwBhMU 3RbfxLPaObqO8C7/Rvlr9WSEJoMx4+c5LYNdzNkw4Wds2MqjeM7VV5CL3 ePavj9iEckQdP3tZQH+6YHLda0pzML4pm3zBrqenZ9AjwmoNAatdkIfo+ g==; X-CSE-ConnectionGUID: hrJQ2cnGRd2kZDm/I//ovQ== X-CSE-MsgGUID: 01ChpFQ3T0azCaVq/52SYw== X-IronPort-AV: E=McAfee;i="6600,9927,11100"; a="14854969" X-IronPort-AV: E=Sophos;i="6.08,231,1712646000"; d="scan'208";a="14854969" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jun 2024 17:14:35 -0700 X-CSE-ConnectionGUID: ndxgRPz4T86LVD6Ja9IC6Q== X-CSE-MsgGUID: HkoHPvGhS5eiiezM73+9Pg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,231,1712646000"; d="scan'208";a="40316681" Received: from pmahaja-mobl2.amr.corp.intel.com (HELO peluse-desk5) ([10.212.44.22]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jun 2024 17:14:35 -0700 Date: Tue, 11 Jun 2024 17:14:33 -0700 From: Paul E Luse To: Reindl Harald Cc: Piergiorgio Sartor , linux-raid@vger.kernel.org Subject: Re: RAID-10 near vs. RAID-1 Message-ID: <20240611171433.375d6e25@peluse-desk5> In-Reply-To: References: X-Mailer: Claws Mail 4.2.0 (GTK 3.24.41; aarch64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 12 Jun 2024 01:04:18 +0200 Reindl Harald wrote: > > > Am 11.06.24 um 20:31 schrieb Piergiorgio Sartor: > > I'm setting up a system with 2 SSD M.2 (NVME). > > > > I was wondering if would it be better, performace > > wise, to have a RAID-10 near layout or a RAID-1. > > > > Looking around I found only one benchmark: > > > > https://strugglers.net/~andy/blog/2019/06/02/exploring-different-linux-raid-10-layouts-with-unbalanced-devices/ > > > > Which uses mixed SSD, NVME and SATA. > > > > Does anybody have any suggestions, links, or > > ideas on the topic? > > > > BTW, practically speaking, what's the difference, > > between the two RAIDs? > > i wouldn't even consider a RAID10 with two disks, especially with SSD > and practically you end with a unsupported RAID1 because there are no > stripes with 2 disks > > I don't disagree but I would recommend you try each variation and measure the performance for yourself. It's a great learning experience if you haven't done it before and there's nothing like trusting your own data over on your own system/config something that someone else has done when there are so many factors that can affect performance. -Paul