From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E5A8C32771 for ; Fri, 19 Aug 2022 22:18:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240221AbiHSWSt (ORCPT ); Fri, 19 Aug 2022 18:18:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39072 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230062AbiHSWSs (ORCPT ); Fri, 19 Aug 2022 18:18:48 -0400 Received: from new4-smtp.messagingengine.com (new4-smtp.messagingengine.com [66.111.4.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AE67FB2768 for ; Fri, 19 Aug 2022 15:18:45 -0700 (PDT) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailnew.nyi.internal (Postfix) with ESMTP id 1492C580881; Fri, 19 Aug 2022 18:18:45 -0400 (EDT) Received: from imap50 ([10.202.2.100]) by compute3.internal (MEProxy); Fri, 19 Aug 2022 18:18:45 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= colorremedies.com; h=cc:cc:content-type:date:date:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:sender:subject:subject:to:to; s=fm2; t=1660947525; x= 1660951125; bh=128wEOp9qbi2WcaWbz4K4eTbe997lW7H3cgghTVg8zE=; b=j 8m7V7KUN9jIFOmJmSRGdvCgeBlQMBQrNCGbpDk1OkuKz/BxxNTi/KV38SZQsu6gz 9GGvNs15gK4PRxObsxX+fZbOeR8xPHDTsQbPAK6RALuCUGWk15JO+gi7ogqyyQVj cIAkNpVvzBdHOz/5qT4oTFm9o69BLs+rSF3xqTp+O6zzCeYMICjPJgoEp32veUcd pNFnVvHBnQ+ue1PR2ZsWkBX3GVINdOg4l0nbF6lB0TU5+cBzyVzdtzwP5uhg4ukH 3HI8rM63tTHi/1L1YwkxsAjdncd7scIiwo+tNGjMVEVlT0Wpie3W3RiuugNGvH3V PioaaVZNLNYlmcfu3kSWg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:date:date:feedback-id :feedback-id:from:from:in-reply-to:in-reply-to:message-id :mime-version:references:reply-to:sender:subject:subject:to:to :x-me-proxy:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm1; t=1660947525; x=1660951125; bh=128wEOp9qbi2WcaWbz4K4eTbe997 lW7H3cgghTVg8zE=; b=5bpIvu8f6K9meNKQPPrF+UK8LmWvtYPzMWLm9BuDSoCt Wosj0E9s+/n/tfmC0Q6pbJQ6+QLSog3+t+Ic0wbsaL6OFMraghQKj18pCDEUyB6f abbPcKJ+m6f1D6F6qQj9G95t7nzI6pifbqWWYBI2piFNvWgkU3kef8czf/orRXPU JmDphkQK2BlU8o/H7nZj3CScG5WUSRffUHBg7T+jH4R8wVN3qbmllSE4YIzUmTu6 j95FEWMghpp/wPOVbz46Y+Pxb10jeHuvw5UNJjoy6K2FBBAW4gAcg6PoMnZIbrbD +NJU8Gcl6Ue0ygp6qvFDzUogBUevyuz9GOmORV0lww== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvfedrvdeivddgtdekucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepofgfggfkjghffffhvfevufgtsehttdertderredtnecuhfhrohhmpedfvehh rhhishcuofhurhhphhihfdcuoehlihhsthhssegtohhlohhrrhgvmhgvughivghsrdgtoh hmqeenucggtffrrghtthgvrhhnpefgvdeukedtfefgfefgtdelffdvieeltefgfedutdff leeuieevieevkeehtdehueenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmh grihhlfhhrohhmpehlihhsthhssegtohhlohhrrhgvmhgvughivghsrdgtohhm X-ME-Proxy: Feedback-ID: i06494636:Fastmail Received: by mailuser.nyi.internal (Postfix, from userid 501) id C234D17003FD; Fri, 19 Aug 2022 18:18:44 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-841-g7899e99a45-fm-20220811.002-g7899e99a Mime-Version: 1.0 Message-Id: <1a102e00-144c-43c8-bb08-7bdb4072d056@www.fastmail.com> In-Reply-To: References: <87v8qokryt.fsf@vps.thesusis.net> Date: Fri, 19 Aug 2022 18:18:21 -0400 From: "Chris Murphy" To: "George Shammas" , "Phillip Susi" Cc: "Btrfs BTRFS" Subject: Re: What exactly is BTRFS Raid 10? Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org man mkfs.btrfs explains some of this. Minimum devices 2. And keep in mind all btrfs raid is at the chunk level. Not block device level. So there's no such thing as a mirrored device, but rather mirrored chunks (two copies of a block group on separate block devices). And yes, you can only lose one device with btrfs raid10. -- Chris Murphy