From mboxrd@z Thu Jan 1 00:00:00 1970 From: Theophanis Kontogiannis Subject: Problem with RAID-5 not adding disks Date: Wed, 23 Jul 2014 01:11:31 +0300 Message-ID: <53CEE193.60409@gmail.com> References: <53CEE0E4.4070906@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-7 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <53CEE0E4.4070906@gmail.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Dear List. Hello. I have the following problem with my CEntOS 6.5 RAID-5 Array of five disks. At some point in time I added the fifth disk, however I do not remember if I added it as a spare or to go up to RAID-6. The power and faulty UPS caught me so my RAID-5 has failed (alongside with the on board controller :) ) After replacing the MB, I am in the following situation: /dev/md0: Version : 1.2 Creation Time : Fri Feb 21 18:06:31 2014 Raid Level : raid5 Used Dev Size : 976630272 (931.39 GiB 1000.07 GB) Raid Devices : 5 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sat Jul 12 22:11:39 2014 State : active, FAILED, Not Started Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Name : tweety.example.com:0 (local to host tweety.example.com) UUID : 953836cd:23314476:5db06922:c886893d Events : 16855 Number Major Minor RaidDevice State 0 0 0 0 removed 1 8 32 1 active sync /dev/sdc 2 0 0 2 removed 4 8 64 3 active sync /dev/sde 4 0 0 4 removed Every effort to add at least one more disk ends up in error: [root ~]# mdadm /dev/md0 --re-add /dev/sdd mdadm: --re-add for /dev/sdd to /dev/md0 is not possible I also made sure that the devices are in the correct physical order. mdadm --examine /dev/sd[b-f] /dev/sdb: Magic : a92b4efc Version : 1.2 Feature Map : 0x2 Array UUID : 953836cd:23314476:5db06922:c886893d Name : tweety.example.com:0 (local to host tweety.example.com) Creation Time : Fri Feb 21 18:06:31 2014 Raid Level : raid5 Raid Devices : 5 Avail Dev Size : 1953260911 (931.39 GiB 1000.07 GB) Array Size : 3906521088 (3725.55 GiB 4000.28 GB) Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB) Data Offset : 262144 sectors Super Offset : 8 sectors Recovery Offset : 0 sectors State : active Device UUID : 7117d844:783abda5:093ee4d9:ba0ac2f0 Update Time : Sat Jul 12 21:32:42 2014 Checksum : 31569c40 - correct Events : 16845 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 0 Array State : AAAAA ('A' =3D=3D active, '.' =3D=3D missing) /dev/sdc: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 953836cd:23314476:5db06922:c886893d Name : tweety.example.com:0 (local to host tweety.example.com) Creation Time : Fri Feb 21 18:06:31 2014 Raid Level : raid5 Raid Devices : 5 Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB) Array Size : 3906521088 (3725.55 GiB 4000.28 GB) Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : active Device UUID : 18bf4347:08c262ec:694eba7f:eb8e6b26 Update Time : Sat Jul 12 22:11:39 2014 Checksum : 55e8716a - correct Events : 16855 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 1 Array State : .AAAA ('A' =3D=3D active, '.' =3D=3D missing) /dev/sdd: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 953836cd:23314476:5db06922:c886893d Name : tweety.example.com:0 (local to host tweety.example.com) Creation Time : Fri Feb 21 18:06:31 2014 Raid Level : raid5 Raid Devices : 5 Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB) Array Size : 3906521088 (3725.55 GiB 4000.28 GB) Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : active Device UUID : 4f77c847:2f567632:66bb5600:9fb2eeba Update Time : Sat Jul 12 21:32:42 2014 Checksum : b19f455b - correct Events : 16855 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 2 Array State : AAAAA ('A' =3D=3D active, '.' =3D=3D missing) /dev/sde: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 953836cd:23314476:5db06922:c886893d Name : tweety.example.com:0 (local to host tweety.example.com) Creation Time : Fri Feb 21 18:06:31 2014 Raid Level : raid5 Raid Devices : 5 Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB) Array Size : 3906521088 (3725.55 GiB 4000.28 GB) Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : active Device UUID : 51b43b6e:7bb8a070:f6375540:28e0b75c Update Time : Sat Jul 12 22:11:39 2014 Checksum : f80197e3 - correct Events : 16855 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 3 Array State : .A.AA ('A' =3D=3D active, '.' =3D=3D missing) /dev/sdf: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 953836cd:23314476:5db06922:c886893d Name : tweety.example.com:0 (local to host tweety.example.com) Creation Time : Fri Feb 21 18:06:31 2014 Raid Level : raid5 Raid Devices : 5 Avail Dev Size : 1953263024 (931.39 GiB 1000.07 GB) Array Size : 3906521088 (3725.55 GiB 4000.28 GB) Used Dev Size : 1953260544 (931.39 GiB 1000.07 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : clean Device UUID : 9f7b1355:936e12f2:813c83a0:13854a6b Update Time : Sat Jul 12 22:11:39 2014 Checksum : cf0bbec1 - correct Events : 16855 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 4 Array State : .A.AA ('A' =3D=3D active, '.' =3D=3D missing) Any chance to revive this array? --=20 Kind Regards, Theophanis Kontogiannis =CC=D6=D7 =C8=CA -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html