From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([198.137.202.10]:53947 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753669Ab2FYRqJ (ORCPT ); Mon, 25 Jun 2012 13:46:09 -0400 Message-ID: <4FE8A3D9.3060400@zytor.com> Date: Mon, 25 Jun 2012 10:46:01 -0700 From: "H. Peter Anvin" MIME-Version: 1.0 To: Chris Mason , "Chris L. Mason" , Marios Titas , linux-btrfs Subject: Re: Feature request: true RAID-1 mode References: <4FE1F9E4.5090301@zytor.com> <20120621005048.GA19507@shiny> <670f2f56-9918-4463-ad89-780ba80bfecc@email.android.com> <20120625152142.GD17638@shiny> In-Reply-To: <20120625152142.GD17638@shiny> Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 06/25/2012 08:21 AM, Chris Mason wrote: > Yes and no. If you have 2 drives and you add one more, we can make it > do all new chunks over 3 drives. But, turning the existing double > mirror chunks into a triple mirror requires a balance. > > -chris So trigger one. This is the exact analogue to the resync pass that is required in classic RAID after adding new media. -hpa