Hi, Encouraged via information found on the wiki <https://raid.wiki.kernel.org/index.php/RAID_Recovery> it would be great to receive advice from linux-raid community. Recently I bought a extra hard drive (next to existing raid level 5 three discs). Unfortunately during physical installation probably disconnect two hard drives of existing raid on my PC. I didn't notice that cables was not properly inserted. After system bootup (Linux Mint 13) md doesn't start. Because /home directory should be mounted on LVM@RAID my system doesn't start properly I've disconnected new hard drive, check and correct every cable on previously working hard drives and run LiveUSB linux to check if RAID will go OK. It wasn't. >From liveCD perspective raid 5 should be worked on three partitions: /dev/sdb1 /dev/sdd1 /dev/sde1 There are also other storage devices on PC: /dev/sda - main drive, system without /home /dev/sdc - LiveUSB usb LiveUSBmint ~ # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md2 : inactive sdd1[1](S) sde1[3](S) 5859354352 blocks super 1.0 unused devices: <none> LiveUSBmint ~ # mdadm --examine /dev/sd[bde]1 /dev/sdb1: Magic : a92b4efc Version : 1.0 Feature Map : 0x0 Array UUID : e494f7d3:bef9154e:1de134d7:476ed4e0 Name : tobik:2 Creation Time : Wed May 23 00:05:55 2012 Raid Level : raid5 Raid Devices : 3 Avail Dev Size : 5859354352 (2793.96 GiB 2999.99 GB) Array Size : 11718708480 (5587.92 GiB 5999.98 GB) Used Dev Size : 5859354240 (2793.96 GiB 2999.99 GB) Super Offset : 5859354608 sectors State : clean Device UUID : 8aa81e09:22237f15:0801f42d:95104515 Update Time : Fri Jan 17 18:32:50 2014 Checksum : 8454c6e - correct Events : 91 Layout : left-symmetric Chunk Size : 64K Device Role : Active device 0 Array State : AAA ('A' == active, '.' == missing) /dev/sdd1: Magic : a92b4efc Version : 1.0 Feature Map : 0x0 Array UUID : e494f7d3:bef9154e:1de134d7:476ed4e0 Name : tobik:2 Creation Time : Wed May 23 00:05:55 2012 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 5859354352 (2793.96 GiB 2999.99 GB) Super Offset : 5859354608 sectors State : active Device UUID : ec85b3b8:30a31d27:6af31507:dcb4e8dc Update Time : Fri Jan 17 20:07:12 2014 Checksum : 6a2b13f4 - correct Events : 1 Device Role : spare Array State : ('A' == active, '.' == missing) /dev/sde1: Magic : a92b4efc Version : 1.0 Feature Map : 0x0 Array UUID : e494f7d3:bef9154e:1de134d7:476ed4e0 Name : tobik:2 Creation Time : Wed May 23 00:05:55 2012 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 5859354352 (2793.96 GiB 2999.99 GB) Super Offset : 5859354608 sectors State : active Device UUID : 0bc9b05f:bc35f218:82798504:ef62ff32 Update Time : Fri Jan 17 20:07:12 2014 Checksum : 56831dcb - correct Events : 1 Device Role : spare Array State : ('A' == active, '.' == missing) mint etc # mdadm --examine /dev/sd[bde]1 | egrep "/dev/sd|Events|Role|Time" /dev/sdb1: Creation Time : Wed May 23 00:05:55 2012 Update Time : Fri Jan 17 18:32:50 2014 Events : 91 Device Role : Active device 0 /dev/sdd1: Creation Time : Wed May 23 00:05:55 2012 Update Time : Fri Jan 17 20:07:12 2014 Events : 1 Device Role : spare /dev/sde1: Creation Time : Wed May 23 00:05:55 2012 Update Time : Fri Jan 17 20:07:12 2014 Events : 1 Device Role : spare LiveUSBmint ~ # uname -a Linux mint 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux LiveUSBmint ~ # mdadm -V mdadm - v3.2.5 - 18th May 2012 It is possible to recover Raid 5 from this disks? I consider "Restoring array by recreating..." <https://raid.wiki.kernel.org/index.php/RAID_Recovery#Restore_array_by_recreating_.28after_multiple_device_failure.29> but I would like to know Your opinion. According to wiki it should be considered as *last* resort. P.S. Fortunately I have a backup, but time spend on recover can take much longer. Best regards, -- Mariusz Zalewski -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
