From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from vps.thesusis.net (vps.thesusis.net [34.202.238.73]) (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 D62723B799 for ; Mon, 12 Feb 2024 16:19:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=34.202.238.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707754763; cv=none; b=L0OF976nsaD2zpolULzVdzygLfM5pNb75fFOnrMRhTzeDDXvcuXzRfKnsUC7NtHkV1vywbeY61cRZsnFLRZxMuS3fYRW1wtEF38EyXfr8nSrADqk7N2/nML00vq3GAfp/gJqKfmTa81/QfMyjnvDZhq9jzC7oL2w/J4BD1nMR9k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707754763; c=relaxed/simple; bh=6INu10iYBY7hxtmL++lS6NKnEGmkakm/bIsKIDZSflc=; h=From:To:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=F3xwemPrU3mt6YFPAMiHl9YFs19uDJ1HPvLay3RaADSNw5thh8k8maauFcVWqaAobv2/ZrNVtLUrpPXBYTYWRmOLicvLPerylD50V9TwQMamP+xTsfs/akbc07w2+ZjadKNheWOwahugFTWzfMIocqFUELdobpqGXRucUe5xJhc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=thesusis.net; spf=none smtp.mailfrom=vps.thesusis.net; arc=none smtp.client-ip=34.202.238.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=thesusis.net Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=vps.thesusis.net Received: by vps.thesusis.net (Postfix, from userid 1000) id B511D230DF; Mon, 12 Feb 2024 11:19:15 -0500 (EST) From: Phillip Susi To: Juan P C , "linux-raid@vger.kernel.org" Subject: Re: missing Levels. In-Reply-To: References: Date: Mon, 12 Feb 2024 11:19:15 -0500 Message-ID: <87o7clmz98.fsf@vps.thesusis.net> Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Juan P C writes: > Enmotus FuzeDrive 1.6TB its actually a QLC 2TB M.2 NVMe PCIe > that Requires Windows Raid drivers. > > Has built-in different technologies, All-in-one. > > #1. Smart Cache RAID mode... > Small fast SSD + Larger HDD. > Similar to intel Optane or Apple Fusion Drive, > But both solid, smarter, > defrag the ssd, > moves most access files to Cache drive, > and files with less access to Main/Large storage. Caching isn't RAID. If you want caching, see dm-cache or bcache. > #2. RAID2 mode. RAID2 isn't something that really exists in the industry. According to wikipedia, it was once used to refer to a bit level, rather than block level type of striping with parity. These people seem to be making up their own system and it sounds like snakeoil. > the drive is partitioned in 2. > 1/4 of the 2TB QLC is used in Raid level=2 mode. > > The reason is to emulate an SLC with QLC. > Increase speed & longevity by 4x > By reducing size 1/4. I can't tell if you are talking about one drive, or two. You can't magically speed up a single drive nor increase its longetivity. > Real SLC are very expensive & power hungry. > QLC are cheap. > > Basically 2 Raids in 1. > Inception. Which two? raid10 is "2 raids in 1" ( raid0 and raid1 ).