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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..!

Dear sagar

do you creating RAID 1 with three disk ?

what is wrong in creating raid 1 with 3 disks...?

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

Try this

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

Thanks

vishesh,
thanks for your response. i will try that and respond to you. thanks a lot.

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.

Is there any relevant messages in log files.

Thanks

vishesh,
I will check out and let u know.