From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([198.137.202.10]:37869 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757107Ab2FTQ1W (ORCPT ); Wed, 20 Jun 2012 12:27:22 -0400 Message-ID: <4FE1F9E4.5090301@zytor.com> Date: Wed, 20 Jun 2012 09:27:16 -0700 From: "H. Peter Anvin" MIME-Version: 1.0 To: linux-btrfs Subject: Feature request: true RAID-1 mode Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Yet another boot loader support request. Right now btrfs' definition of "RAID-1" with more than two devices is a bit unorthodox: it stores on any two drives. "True RAID-1" would instead store N copies on each of N devices, the same way an actual RAID-1 would operate with an arbitrary number of devices. This means that a bootloader can consider a single device in isolation: if the firmware gives access only to a single device, it can be booted. Since /boot is usually a very small amount of data, this is a very reasonable tradeoff. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.