Can't mount /dev/md0 Raid5

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The md0 is ext4 formated. But now, I can even start the SO when all the disk are pluged. One of them is corrupt. It makes an odd sound at the starting. However if I unplug that disk the system start fine, however no RAID is detected and after assemble it says:


root@grafico:/home/jose# mdadm --detail /dev/md0
/dev/md0:
                 Version : 1.2
      Creation Time : Sat Aug 5 23:10:50 2017
            Raid Level : raid5
     Used Dev Size : 976629760 (931.39 GiB 1000.07 GB)
        Raid Devices : 4
        Total Devices : 3
          Persistence : Superblock is persistent

         Update Time : Thu Sep 21 13:34:35 2017
                     State : active, degraded, Not Started
      Active Devices : 3
   Working Devices : 3
      Failed Devices : 0
      Spare Devices : 0

                  Layout : left-symmetric
          Chunk Size : 512K

                   Name : servidor:0
                    UUID : 0b44a3b8:83eafabc:644afc87:bdb5b1f3
                  Events : 3109

    Number   Major   Minor   RaidDevice State
-       0        0        0      removed
1       8       17        1      active sync   /dev/sdb1
2       8       33        2      active sync   /dev/sdc1
3       8       49        3      active sync   /dev/sdd1


I'm not sure how to continue, since i don't see the RAID. GParted see the disks, however doesn't see the md0 and I'm bit scared if I lost the data content.


Joseba Ibarra
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