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Thread: mdadm RAID 5 - is there something wrong here?

  1. #1
    Join Date
    Mar 2007
    Beans
    48

    mdadm RAID 5 - is there something wrong here?

    So I have a server with 5 1tb hard drives that have been working in a RAID 5 configuration for about 8 months now. Everything is working fine, I am just wanting to add three more hard drives to the array (grow it). Well I went to check the status on the current RAID 5 before I get ready to add the other three hard drives to it and it looks like there are only 4 hard drives working for some reason. Here is details from mdadm:
    Code:
    harold@server:~$ sudo mdadm --detail /dev/md0
    /dev/md0:
            Version : 00.90.03
      Creation Time : Mon Feb 11 16:48:31 2008
         Raid Level : raid5
         Array Size : 3907039744 (3726.04 GiB 4000.81 GB)
      Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
       Raid Devices : 5
      Total Devices : 4
    Preferred Minor : 0
        Persistence : Superblock is persistent
    
        Update Time : Sun Jul 13 23:12:12 2008
              State : clean, degraded
     Active Devices : 4
    Working Devices : 4
     Failed Devices : 0
      Spare Devices : 0
    
             Layout : left-symmetric
         Chunk Size : 64K
    
               UUID : 72fa18f5:bf5d1a62:31a05266:02bffc2c
             Events : 0.54
    
        Number   Major   Minor   RaidDevice State
           0       8      113        0      active sync   /dev/sdh1
           1       0        0        1      removed
           2       8       33        2      active sync   /dev/sdc1
           3       8       49        3      active sync   /dev/sdd1
           4       8       65        4      active sync   /dev/sde1
    I dont know why I am getting this error:

    Code:
           1       0        0        1      removed
    If I go into the partition editor I can see that I have all eight hard drives hooked up to the computer and running, but I just don't understand this. I am not the greatest with linux but am getting be decent, so take it easy on me! Thanks!

    -haryy

  2. #2
    Join Date
    Mar 2007
    Beans
    48

    Re: mdadm RAID 5 - is there something wrong here?

    Anybody have any ideas? I really am not the greatest with linux but would like to make sure that it is working correctly.

  3. #3
    Join Date
    Jul 2008
    Location
    Philippines
    Beans
    9
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: mdadm RAID 5 - is there something wrong here?

    Looking at the output of: sudo mdadm --detail /dev/md0 you will see the lines:

    Raid Devices : 5
    Total Devices : 4

    This means that your RAID device is a RAID 5 type.
    Unfortunately one of your device seems to be missing OR has failed.

    Since your RAID 5 device is missing one (1) component,
    your data is still intact but the RAID device cannot afford another
    failing component.

    You must add another/separate Linux RAID partition immediately...
    by using the --manage /dev/md0 --add /dev/???

    Don't forget to create a disk partition (must be on another disk)
    of EXACTLY the same size (use blocks not megabytes/gigabytes) as
    that of the other components of your RAID device.

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