From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Muratet Subject: Add disks and convert level 0 to level 5 Date: Wed, 10 Sep 2014 11:15:24 -0500 Message-ID: <8CF94689-0AD6-4B87-BC0C-815F794549E7@gmail.com> References: <20140901083137.4772c8c5@notabene.brown> Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT Return-path: In-Reply-To: <20140901083137.4772c8c5@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids I have a two-disk RAID0 system that is working splendidly, thanks to the list for the help. I managed to get my hands on more identical disks and since I have the disks and because I'm adding precious data, I'd like to add two more disks and grow to RAID5. I have partitioned the two new drives to type 'fd', /dev/sde and /dev/sdf I believe the command to accomplish the change is this: mdadm /dev/md0 --grow --level=5 --add /dev/sde /dev/sdf Following the old adage "measure twice, cut once", is this syntax correct? Is there any danger of data loss in such a conversion? Thanks Mike