From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Stefan G. Weichinger" Subject: from 2x RAID1 to 1x RAID6 ? Date: Tue, 07 Jun 2011 20:12:33 +0200 Message-ID: <4DEE6A11.1030205@xunil.at> Reply-To: lists@xunil.at Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: "linux-raid@vger.kernel.org" List-Id: linux-raid.ids Greetings, could you please advise me how to proceed? On a server I have 2 RAID1-arrays, each consisting of 2 TB-drives: md5 : active raid1 sde1[0] sdf1[1] 976759936 blocks [2/2] [UU] md6 : active raid1 sdh1[1] sdg1[0] 976759936 blocks [2/2] [UU] md5 and md6 are right now physical volumes (PVs) in an LVM-volume-group. Nearly all the space is used right now (1.7 TB out of the ~2 TB). Now I would like to move things to a more reliable RAID6 consisting of all the four TB-drives ... How to do that with minimum risk? For sure it would be best to move all data aside, stop the arrays and build a new one ... etc Failing two drives and remove them from the RAID1s to build a new degraded RAID6 seems dangerous to me? Maybe I overlook a clever alternative? Suggestions welcome, thanks in advance. Stefan