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MDADM doesn't give error when RAID FAILS

Mr-sark asked
Last Modified: 2013-12-06
After getting some great pointer about  managing my RAID 5 array with "mdadm" I ran into a problem.

When I pull out a random disk from the /dev/md0 array - I should get an error on my display. When i'm behind the terminal and I pull out a disk Red Hat keeps spitting that a device is missing! e.a. /dev/sdd1.

When I do a "mdadm --detail /dev/md0" there doesn't seem to be anything wrong while i pulled out 1 disk. ? how is that ? is it a bug ?
I can't seem to get this fixed, but I really want to get it working so I can do monitoring from home.

Here is my "mdadm --detail /dev/md0" ouput:

 Version : 00.90.01
  Creation Time : Mon Feb 14 15:23:01 2005
     Raid Level : raid5
     Array Size : 142238976 (135.65 GiB 145.65 GB)
    Device Size : 35559744 (33.91 GiB 36.41 GB)
   Raid Devices : 5
  Total Devices : 5
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Thu May 26 15:29:59 2005
          State : clean
 Active Devices : 5
Working Devices : 5
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-asymmetric
     Chunk Size : 64K

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1
       2       8       49        2      active sync   /dev/sdd1
       3       8       65        3      active sync   /dev/sde1
       4       8       81        4      active sync   /dev/sdf1
           UUID : 6820c415:e457679b:ff59e0ba:0e72128a
         Events : 0.4993
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