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Old 07-30-2009, 04:10 PM   #1
saagar
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Location: Chennai, India
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Software RAID issue in RHEL5


hi friends,
I have created RAID 1 containing 3 partitions in the same hard disk.
Code:
#mdadm --create /dev/md0 --level=1 --raid-devices=3 /dev/hda{11,12,13}
#mdadm --detail /dev/md0
Number   Major   Minor   RaidDevice State
       0       3       11        0      active sync   /dev/hda11
       1       3       12        1      active sync   /dev/hda12
       2       0        0        2      active sync   /dev/hda13
Now, I am setting the /dev/hda13 as faulty..
Code:
#mdadm --set-faulty /dev/md0 /dev/hda13
#mdadm --detail /dev/md0

  Number   Major   Minor   RaidDevice State
       0       3       11        0      active sync   /dev/hda11
       1       3       12        1      active sync   /dev/hda12
       2       0        0        2      removed

       3       3       13        -      faulty spare   /dev/hda13
Now, i rebooted the system and when I type
#mdadm --detail /dev/md0, it shows the following:
Code:
Number   Major   Minor   RaidDevice State
       0       3       11        0      active sync   /dev/hda11
       1       3       12        1      active sync   /dev/hda12
       2       0        0        2      removed
The /dev/hda13 partition is automatically removed..
Why is this so..?

Even if I add a new hot spare and reboot the system, only /dev/hda11 and /dev/hda12 could be seen.. the new hot spare is not permamently sitting there in the raid array...
please help..!
 
Old 07-31-2009, 02:39 AM   #2
vishesh
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Dear sagar

do you creating RAID 1 with three disk ?
 
Old 07-31-2009, 02:40 PM   #3
saagar
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what is wrong in creating raid 1 with 3 disks...?

by the way, the same error occurs for RAID 5 also.

Last edited by saagar; 08-01-2009 at 10:43 AM.
 
Old 08-01-2009, 12:59 AM   #4
vishesh
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Try this

#mdadm --create /dev/md0 --level=1 -x 1 --raid-devices=3 /dev/hda{11,12,13}

Thanks
 
Old 08-01-2009, 10:44 AM   #5
saagar
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vishesh,
thanks for your response. i will try that and respond to you. thanks a lot.
 
Old 08-02-2009, 12:47 AM   #6
saagar
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hi vishesh,
I tried with the -x option, it accepts the command and works, but..once I fail one of raid array disks, this spare becomes active and the failed one becomes a faulty spare, ...then once i reboot the machine and issue the mdadm --detail /dev/md0 both the faulty spare and the new active device(which we configured as a spare before)are removed.
the same thing happens for raid5.
can u help with this....?
thanks.
 
Old 08-02-2009, 03:53 AM   #7
vishesh
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Is there any relevant messages in log files.

Thanks
 
Old 08-03-2009, 12:24 PM   #8
saagar
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vishesh,
I will check out and let u know.
 
  


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