From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Muniz Subject: Undestanding /proc/mdstat with raid10 Date: Tue, 09 Aug 2011 04:14:05 -0300 Message-ID: <4E40DE3D.2020005@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hello, I have searched a lot trying to answer this. I have a raid10 array on an openfiler box. Personalities : [raid10] md0 : active raid10 sde1[3] sdd1[2] sdc1[1] sdb1[0] 181760 blocks super 1.2 64K chunks 2 near-copies [4/4] [UUUU] unused devices: Actually this is a Virtualbox machine with the same disk setup. I made 6 x 100 Mbytes disks for the test. How can I tell which disks are mirrored? My goal is to free the two mirror disks from md0, add two more free disks, create a new md1 raid5 array, and move the contents from md0 to md1 Thanks in advance. Sebastian PS: in case it is relevant, i am adding the detailed md0 output. [root@of ~]# mdadm --misc --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Tue Aug 9 03:01:14 2011 Raid Level : raid10 Array Size : 181760 (177.53 MiB 186.12 MB) Used Dev Size : 90880 (88.76 MiB 93.06 MB) Raid Devices : 4 Total Devices : 4 Persistence : Superblock is persistent Update Time : Tue Aug 9 03:20:06 2011 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : near=2 Chunk Size : 64K Name : of:0 (local to host of) UUID : 63b2145a:49030744:41b8f5b4:cb11bc1d Events : 19 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 8 33 1 active sync /dev/sdc1 2 8 49 2 active sync /dev/sdd1 3 8 65 3 active sync /dev/sde1