From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Subject: Raid 5 events not updates after resync Date: Sun, 02 Mar 2014 21:33:56 +1100 Message-ID: <53130914.9050309@internode.on.net> 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 Moving existing raid 5 to new linux install. Some strange stuff gone on with one array/drive (This is after my latest assemble with the 3 good drives and adding failed drive & allowing resync) 4 Disk array raid 5 mdadm --assemble /dev/md2 /dev/sdc /dev/sda /dev/sdd mdadm : /dev/md2 assembled from 3 drives - need all 4 drives to assemble (use --run to insist) mdadm --assemble /dev/md2 /dev/sdc /dev/sda /dev/sdd --run mdadm : /dev/md2 has been started with 3 drives (out of 4) mdadm -a /dev/md2 /dev/sdb This has been going on for 2-3 re syncs, each time I reboot ends up in same situation. No disk errors in dmesg, resync completes without an issue.. Any ideas? 3 out of 4 disks show events as 506196 1 disk shows events as 184869 (The disk added in as spare, this seems strange to me) Regards John /dev/sda: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 73ea3bd2:50b609a1:768a7e19:ca3ef9f0 Name : storagepc:raid-2tb Creation Time : Fri Oct 28 06:31:30 2011 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB) Array Size : 5860540224 (5589.05 GiB 6001.19 GB) Used Dev Size : 3907026816 (1863.02 GiB 2000.40 GB) Data Offset : 2048 sectors Super Offset : 8 sectors Unused Space : before=1968 sectors, after=304 sectors State : clean Device UUID : 7a9638fc:774dd136:431f0d15:37853f2a Update Time : Sun Mar 2 09:19:18 2014 Checksum : 827e2559 - correct Events : 506196 Layout : left-symmetric Chunk Size : 64K Device Role : Active device 2 Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdb: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 73ea3bd2:50b609a1:768a7e19:ca3ef9f0 Name : storagepc:raid-2tb Creation Time : Fri Oct 28 06:31:30 2011 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB) Array Size : 5860540224 (5589.05 GiB 6001.19 GB) Used Dev Size : 3907026816 (1863.02 GiB 2000.40 GB) Data Offset : 2048 sectors Super Offset : 8 sectors Unused Space : before=1968 sectors, after=304 sectors State : clean Device UUID : 14d83150:d2b9ad69:9e004df3:06819bc3 Update Time : Thu Nov 1 08:14:09 2012 Checksum : 7e6700eb - correct Events : 184869 Layout : left-symmetric Chunk Size : 64K Device Role : Active device 0 Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdc: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 73ea3bd2:50b609a1:768a7e19:ca3ef9f0 Name : storagepc:raid-2tb Creation Time : Fri Oct 28 06:31:30 2011 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB) Array Size : 5860540224 (5589.05 GiB 6001.19 GB) Used Dev Size : 3907026816 (1863.02 GiB 2000.40 GB) Data Offset : 2048 sectors Super Offset : 8 sectors Unused Space : before=1968 sectors, after=304 sectors State : clean Device UUID : 903c8b07:038d4a1c:8588eaa9:defc0550 Update Time : Sun Mar 2 09:19:18 2014 Checksum : 2dedebed - correct Events : 506196 Layout : left-symmetric Chunk Size : 64K Device Role : Active device 1 Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdd: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 73ea3bd2:50b609a1:768a7e19:ca3ef9f0 Name : storagepc:raid-2tb Creation Time : Fri Oct 28 06:31:30 2011 Raid Level : raid5 Raid Devices : 4 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB) Array Size : 5860540224 (5589.05 GiB 6001.19 GB) Used Dev Size : 3907026816 (1863.02 GiB 2000.40 GB) Data Offset : 2048 sectors Super Offset : 8 sectors Unused Space : before=1968 sectors, after=304 sectors State : clean Device UUID : 090464a9:11cc8cf4:e22aa863:7d880f58 Update Time : Sun Mar 2 09:19:18 2014 Checksum : 69d02087 - correct Events : 506196 Layout : left-symmetric Chunk Size : 64K Device Role : Active device 3 Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing) (This is junk as it has no relationship to the actual array!) mdadm --examine /dev/md126 /dev/md126: Version : 1.2 Raid Level : raid0 Total Devices : 4 Persistence : Superblock is persistent State : inactive Name : storagepc:raid-2tb UUID : 73ea3bd2:50b609a1:768a7e19:ca3ef9f0 Events : 506196 Number Major Minor RaidDevice - 8 0 - /dev/sda - 8 16 - /dev/sdb - 8 32 - /dev/sdc - 8 48 - /dev/sdd cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md125 : active (auto-read-only) raid5 sdp[5] sdh[1] sdf[4] sdg[2] 2197720128 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU] md126 : inactive sdc[6](S) sda[5](S) sdb[0](S) sdd[4](S) 7814054240 blocks super 1.2 md127 : active (auto-read-only) raid5 sdj[2] sdn[4] sdm[1] sdl[5] 2930284224 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU] unused devices: