From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from moutng.kundenserver.de ([212.227.17.9]:58165 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756931Ab3FMVJE (ORCPT ); Thu, 13 Jun 2013 17:09:04 -0400 Message-ID: <51BA34EC.1080800@friedels.name> Date: Thu, 13 Jun 2013 23:09:00 +0200 From: Hendrik Friedel MIME-Version: 1.0 To: linux-btrfs Subject: raid0, raid1, raid5, what to choose? Content-Type: text/plain; charset=ISO-8859-15; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hello, I'd appreciate your recommendation on this: I have three hdd with 3TB each. I intend to use them as raid5 eventually. currently I use them like this: # mount|grep sd /dev/sda1 on /mnt/Datenplatte type ext4 /dev/sdb1 on /mnt/BTRFS/Video type btrfs /dev/sdb1 on /mnt/BTRFS/rsnapshot type btrfs #df -h /dev/sda1 2,7T 1,3T 1,3T 51% /mnt/Datenplatte /dev/sdb1 5,5T 5,4T 93G 99% /mnt/BTRFS/Video /dev/sdb1 5,5T 5,4T 93G 99% /mnt/BTRFS/rsnapshot Now, what surprises me, and here I lack memory- is that sdb appears twice.. I think, I created a raid1, but how can I find out? #/usr/local/smarthome# ~/btrfs/btrfs-progs/btrfs fi show /dev/sdb1 Label: none uuid: 989306aa-d291-4752-8477-0baf94f8c42f Total devices 2 FS bytes used 2.68TB devid 2 size 2.73TB used 2.73TB path /dev/sdc1 devid 1 size 2.73TB used 2.73TB path /dev/sdb1 Now, I wanted to convert it to raid0, because I lack space and redundancy is not important for the Videos and the Backup, but this fails: ~/btrfs/btrfs-progs/btrfs fi balance start -dconvert=raid0 /mnt/BTRFS/ ERROR: error during balancing '/mnt/BTRFS/' - Inappropriate ioctl for device dmesg does not help here. Anyway: This gave me some time to think about this. In fact, as soon as raid5 is stable, I want to have all three as a raid5. Will this be possible with a balance command? If so: will this be possible as soon as raid5 is stable, or will I have to wait longer? What approach do you recommend? Greetings, Hendrik