Hi, Returning once again to this list for some help and advice. Long story short I have a failed Raid 6 array that I would like to try and recover. The data is not vitally important as I have most of it in a number of other places, but I'd like to try and resurrect the array if possible, as much to learn as anything. The array had an issue some while ago, but as I had no space to store any recovered data I left the machine off. The OS is Xubuntu 14.04 The system consisted of a boot/OS array with two mirrored drives (which is fine), and then a Raid 6 data array which consisted of 8 300Gb Ultra Wide SCSI drives. 7 were in the array with a spare (if my memory serves me correctly). As far as I remember the machine suffered a power failure. When it powered up again, the system tried to restore/rebuild the array. During this I think the power failed again (don't ask.....) It suffered at lest one disk failure. I then left it off to try another day. Drive layout is as follows: RAID 1 mirror /dev/sda + b RAID 6 array /dev/sd[cdefghij] /dev/sdd was dead and has been replaced. As far as I remember I created the array, then added a partition and then LVM (possibly not a good idea in hindsight). So none of the individual drives show a partition...... I had a good read here and created some of the scripts. https://raid.wiki.kernel.org/index.php/Recovering_a_damaged_RAID Here is some of the output I have got so far. Any advice appreciated. B. Rgds John root@garage:~# sed -e '/^[[:space:]]*$/d' -e '/^[[:space:]]*#/d' /etc/mdadm/mdadm.conf CREATE owner=root group=disk mode=0660 auto=yes HOMEHOST <system> MAILADDR root DEVICE partitions ARRAY /dev/md0 metadata=1.2 name=garage:0 UUID=90624393:3b638ad8:9aeb81ca:fa3caafc ARRAY /dev/md1 metadata=1.2 name=garage:1 UUID=f624610a:b711ff4b:3b126550:a8f78732 ARRAY /dev/md/Data metadata=1.2 name=garage:Data UUID=1a2f92b0:d7c1a540:165b9ab7:0baed449 cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md127 : inactive sdf[3](S) sdh[5](S) 585675356 blocks super 1.2 md1 : active raid1 sda5[2] sdb5[3] 292674368 blocks super 1.2 [2/2] [UU] md0 : active raid1 sda1[2] sdb1[3] 248640 blocks super 1.2 [2/2] [UU] unused devices: <none> mdadm --stop /dev/md127 Notice the following will not work with /dev/sdc1 as there is no partition on the drive. Have to use /dev/sdc : UUID=$(mdadm -E /dev/sdc|perl -ne '/Array UUID : (\S+)/ and print $1') echo $UUID 1a2f92b0:d7c1a540:165b9ab7:0baed449 DEVICES=$(cat /proc/partitions | parallel --tagstring {5} --colsep ' +' mdadm -E /dev/{5} |grep $UUID | parallel --colsep '\t' echo /dev/{1}) echo $DEVICES /dev/sdc /dev/sde /dev/sdf /dev/sdh /dev/sdi Create overlays: root@garage:~# ./overlayoptions.sh create Currently set device are /dev/sdc /dev/sde /dev/sdf /dev/sdh /dev/sdi Input is create Creating Overlay free 235071M Clear any old overlays Removing Overlay /dev/sdc 286102M /dev/loop0 /dev/mapper/sdc /dev/sde 286102M /dev/loop1 /dev/mapper/sde /dev/sdf 286102M /dev/loop2 /dev/mapper/sdf /dev/sdh 286102M /dev/loop3 /dev/mapper/sdh /dev/sdi 286102M /dev/loop4 /dev/mapper/sdi root@garage:~# mdadm --assemble --force /dev/md127 $OVERLAYS mdadm: clearing FAULTY flag for device 3 in /dev/md127 for /dev/mapper/sdh mdadm: Marking array /dev/md127 as 'clean' mdadm: failed to add /dev/mapper/sde to /dev/md127: Invalid argument mdadm: failed to add /dev/mapper/sdi to /dev/md127: Invalid argument mdadm: /dev/md127 assembled from 2 drives and 1 rebuilding - not enough to start the array. root@garage:~# mdadm --examine /dev/sd[cdefghij] |grep Event Events : 1911 Events : 1911 Events : 1910 Events : 1910 Events : 1911 (Two drives have older Events) root@garage:~# mdadm --examine /dev/sd[cdefghij] /dev/sdc: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 1a2f92b0:d7c1a540:165b9ab7:0baed449 Name : garage:Data (local to host garage) Creation Time : Mon Sep 8 16:44:06 2014 Raid Level : raid6 Raid Devices : 7 Avail Dev Size : 585675356 (279.27 GiB 299.87 GB) Array Size : 1464186880 (1396.36 GiB 1499.33 GB) Used Dev Size : 585674752 (279.27 GiB 299.87 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : active Device UUID : 9b89d817:36633ebf:6d30d5ea:5bba21a0 Update Time : Sun Jan 8 13:47:20 2017 Checksum : 448c93b2 - expected 448c93b1 Events : 1911 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 0 Array State : A.AAAAA ('A' == active, '.' == missing) /dev/sdd: MBR Magic : aa55 /dev/sde: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 1a2f92b0:d7c1a540:165b9ab7:0baed449 Name : garage:Data (local to host garage) Creation Time : Mon Sep 8 16:44:06 2014 Raid Level : raid6 Raid Devices : 7 Avail Dev Size : 585675356 (279.27 GiB 299.87 GB) Array Size : 1464186880 (1396.36 GiB 1499.33 GB) Used Dev Size : 585674752 (279.27 GiB 299.87 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : active Device UUID : 3ee17acf:73dabec5:22dd87f5:981b904f Update Time : Sun Jan 8 13:47:20 2017 Checksum : bcd07086 - expected bcd07085 Events : 1911 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 2 Array State : A.AAAAA ('A' == active, '.' == missing) /dev/sdf: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 1a2f92b0:d7c1a540:165b9ab7:0baed449 Name : garage:Data (local to host garage) Creation Time : Mon Sep 8 16:44:06 2014 Raid Level : raid6 Raid Devices : 7 Avail Dev Size : 585675356 (279.27 GiB 299.87 GB) Array Size : 1464186880 (1396.36 GiB 1499.33 GB) Used Dev Size : 585674752 (279.27 GiB 299.87 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : clean Device UUID : 6b8031bd:2a03c716:c2633b9f:f3b0a1d1 Update Time : Sun Jan 8 13:42:11 2017 Checksum : 2757532f - correct Events : 1910 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 3 Array State : AAAAAAA ('A' == active, '.' == missing) /dev/sdg: MBR Magic : aa55 /dev/sdh: Magic : a92b4efc Version : 1.2 Feature Map : 0x12 Array UUID : 1a2f92b0:d7c1a540:165b9ab7:0baed449 Name : garage:Data (local to host garage) Creation Time : Mon Sep 8 16:44:06 2014 Raid Level : raid6 Raid Devices : 7 Avail Dev Size : 585675356 (279.27 GiB 299.87 GB) Array Size : 1464186880 (1396.36 GiB 1499.33 GB) Used Dev Size : 585674752 (279.27 GiB 299.87 GB) Data Offset : 262144 sectors Super Offset : 8 sectors Recovery Offset : 0 sectors State : clean Device UUID : 03670c0d:342627ae:391927a0:d8ba78d4 Update Time : Sun Jan 8 13:42:11 2017 Checksum : 12551c41 - correct Events : 1910 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 1 Array State : AAAAAAA ('A' == active, '.' == missing) /dev/sdi: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 1a2f92b0:d7c1a540:165b9ab7:0baed449 Name : garage:Data (local to host garage) Creation Time : Mon Sep 8 16:44:06 2014 Raid Level : raid6 Raid Devices : 7 Avail Dev Size : 585675356 (279.27 GiB 299.87 GB) Array Size : 1464186880 (1396.36 GiB 1499.33 GB) Used Dev Size : 585674752 (279.27 GiB 299.87 GB) Data Offset : 262144 sectors Super Offset : 8 sectors State : active Device UUID : e8587c1b:e9c60b00:18e20a16:1b145b10 Update Time : Sun Jan 8 13:47:20 2017 Checksum : 246cd221 - expected 246ad21f Events : 1911 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 6 Array State : A.AAAAA ('A' == active, '.' == missing) /dev/sdj: MBR Magic : aa55
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