I've got a synology ds1812+
Could have sworn I did raid 6, but md says raid5 (dont recall
personalities pre-failure)
Lost disk 2, was rebuilding and disk 6 crashed.
Booting from a fresh machine, and attempting to discover the arrays
(md125 is the target)
root@ds:~# mdadm --assemble --scan
mdadm: /dev/md/DiskStation:2 assembled from 6 drives - not enough to
start the array.
mdadm: /dev/md/1_1 has been started with 7 drives (out of 8).
mdadm: /dev/md/0_1 has been started with 7 drives (out of 8).
mdadm: /dev/md/DiskStation:2 exists - ignoring
mdadm: /dev/md125 assembled from 6 drives - not enough to start the array.
root@ds:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md126 : active raid1 sda1[0] sdh1[7] sdg1[6] sde1[4] sdd1[3] sdc1[2] sdb1[1]
2490176 blocks [8/7] [UUUUU_UU]
md127 : active raid1 sda2[0] sdb2[7] sdh2[6] sdg2[5] sde2[3] sdd2[2] sdc2[1]
2097088 blocks [8/7] [UUUU_UUU]
md2 : active raid5 sdf3[5]
20478809792 blocks super 1.2 level 5, 64k chunk, algorithm 2
[8/1] [_____U__]
md1 : active raid1 sdf2[0]
2097088 blocks [8/1] [U_______]
md0 : active raid1 sdf1[0]
2490176 blocks [8/1] [U_______]
Attempting to assemble gives the same error:
root@ds:~# mdadm --assemble --force /dev/md125 /dev/sda3 /dev/sdb3
/dev/sdc3 /dev/sdd3 /dev/sde3 /dev/sdg3 /dev/sdh3
mdadm: /dev/md125 assembled from 6 drives - not enough to start the array.
but also yields:
root@ds:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md125 : inactive sda3[8](S) sdh3[7](S) sdg3[6](S) sde3[4](S)
sdd3[3](S) sdc3[2](S) sdb3[9](S)
20478810915 blocks super 1.2
but:
root@ds:~# mdadm --detail /dev/md125
mdadm: md device /dev/md125 does not appear to be active.
I attempt to run:
root@ds:~# mdadm --manage --run /dev/md125
mdadm: started /dev/md125
root@ds:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md125 : active raid5 sda3[8] sdh3[7] sdg3[6] sde3[4] sdd3[3] sdc3[2]
20478809792 blocks super 1.2 level 5, 64k chunk, algorithm 2
[8/6] [U_UUU_UU]
Add back in the disk we were rebuilding (disk 2) before we lost disk 6:
root@ds:~# mdadm --manage /dev/md125 --add /dev/sdb3
mdadm: added /dev/sdb3
root@ds:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md125 : active raid5 sdb3[9](S) sda3[8] sdh3[7] sdg3[6] sde3[4] sdd3[3] sdc3[2]
20478809792 blocks super 1.2 level 5, 64k chunk, algorithm 2
[8/6] [U_UUU_UU]
But nothing is happening, recovery-wise:
root@ds:~# mdadm -D /dev/md125
/dev/md125:
Version : 1.2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Array Size : 20478809792 (19530.12 GiB 20970.30 GB)
Used Dev Size : 2925544256 (2790.02 GiB 2995.76 GB)
Raid Devices : 8
Total Devices : 7
Persistence : Superblock is persistent
Update Time : Sun Apr 16 16:22:16 2017
State : clean, FAILED
Active Devices : 6
Working Devices : 7
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Name : DiskStation:2
UUID : e299685e:5842617d:6d90981b:8f7b91e4
Events : 351742
Number Major Minor RaidDevice State
8 8 3 0 active sync /dev/hda3
1 0 0 1 removed
2 8 35 2 active sync /dev/sdc3
3 8 51 3 active sync /dev/sdd3
4 8 67 4 active sync /dev/sde3
5 0 0 5 removed
6 8 99 6 active sync /dev/sdg3
7 8 115 7 active sync /dev/sdh3
9 8 19 - spare /dev/sdb3
Sooo.. how screwed am I? Can I recover? Detailed drive status from
--examine below:
root@ds:~# cat raid.status
/dev/sda3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f6be170f:999d3a14:0911df81:519c5544
Update Time : Sun Apr 16 16:33:10 2017
Checksum : eef101aa - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 0
Array State : A.AAA.AA ('A' == active, '.' == missing)
/dev/sdb3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 0f426e67:9501ed59:df7ecf80:36f1bc62
Update Time : Sun Apr 16 16:33:10 2017
Checksum : aa51ab8c - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : spare
Array State : A.AAA.AA ('A' == active, '.' == missing)
/dev/sdc3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 10494bba:5db57d5f:bbabfc26:7792e5ad
Update Time : Sun Apr 16 16:33:10 2017
Checksum : f415346b - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 2
Array State : A.AAA.AA ('A' == active, '.' == missing)
/dev/sdd3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 253ec56c:8d4a1ffa:24abf930:a47b2c9e
Update Time : Sun Apr 16 16:33:10 2017
Checksum : 3b74a738 - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 3
Array State : A.AAA.AA ('A' == active, '.' == missing)
/dev/sde3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : c3e94c4f:10a5ff16:05fd1967:2fd44d38
Update Time : Sun Apr 16 16:33:10 2017
Checksum : b1e57c5 - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 4
Array State : A.AAA.AA ('A' == active, '.' == missing)
/dev/sdg3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 8f0770d8:c3e6df4b:f2ab4b40:06c57ad1
Update Time : Sun Apr 16 16:33:10 2017
Checksum : 3b80570b - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 6
Array State : A.AAA.AA ('A' == active, '.' == missing)
/dev/sdh3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e299685e:5842617d:6d90981b:8f7b91e4
Name : DiskStation:2
Creation Time : Fri Oct 17 22:45:17 2014
Raid Level : raid5
Raid Devices : 8
Avail Dev Size : 5851088833 (2790.02 GiB 2995.76 GB)
Array Size : 40957619584 (19530.12 GiB 20970.30 GB)
Used Dev Size : 5851088512 (2790.02 GiB 2995.76 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : fba39acd:5df21885:b9a329c5:cffdf686
Update Time : Sun Apr 16 16:33:10 2017
Checksum : a43e2fa2 - correct
Events : 351744
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 7
Array State : A.AAA.AA ('A' == active, '.' == missing)
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