DSM says that my system partition is crashed and I should backup and reinstall everything
The only disk of the volume md0 that seems to work is /dev/sdj1; I've 2 spares disks but sysnc does not start probably because the status of the disk /dev/sdj1 is [E] (error)
How can solve this issue without reinstall everything?
ash-4.3# mdadm -D /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Wed Jun 15 13:58:01 2016
Raid Level : raid1
Array Size : 2490176 (2.37 GiB 2.55 GB)
Used Dev Size : 2490176 (2.37 GiB 2.55 GB)
Raid Devices : 12
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri Jan 20 09:40:08 2017
State : clean, degraded
Active Devices : 1
Working Devices : 3
Failed Devices : 0
Spare Devices : 2
UUID : bd8c8583:63c691fc:3017a5a8:c86610be
Events : 0.1926824
Number Major Minor RaidDevice State
0 0 0 0 removed
1 0 0 1 removed
2 0 0 2 removed
3 0 0 3 removed
4 0 0 4 removed
5 0 0 5 removed
6 0 0 6 removed
7 0 0 7 removed
8 8 145 8 active sync /dev/sdj1
9 0 0 9 removed
10 0 0 10 removed
11 0 0 11 removed
12 8 129 - spare /dev/sdi1
13 8 161 - spare /dev/sdk1
ash-4.3# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md2 : active linear sdb3[0] sdf3[4] sde3[3] sdd3[2] sdc3[1]
500177920 blocks super 1.2 64k rounding [5/5] [uUUUU]
md1 : active raid1 sda2[0] sdb2[1] sdc2[4] sdd2[3] sde2[2] sdf2[5] sdg2[6] sdh2[10] sdi2[9] sdj2[8] sdk2[7]
2097088 blocks [12/11] [uUUUUUUUUUU_]
md0 : active raid1 sdi1[12](S) sdj1[8](E) sdk1[13](S)
2490176 blocks [12/1] [________E___]
unused devices: