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Old 02-06-2012, 02:58 AM   #1
daisychick
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how to completely remove software raid1 array


I'm trying to completely delete a software raid 1 array and yet, it keeps coming back. my mdadm.conf has nothing in it anymore and there's no mount point in fstab. I zeroed the superblocks but it keeps showing back up after a reboot. How do I get rid of it? I want to start over with two partitions instead of just one.

1991 sudo mdadm --detail /dev/md0
1992 sudo mdadm --stop /dev/md0
1993 sudo mdadm --zero-superblock /dev/sdb1
1994 sudo mdadm --zero-superblock /dev/sdc1
1995 sudo vi /etc/mdadm/mdadm.conf
 
Old 02-06-2012, 04:15 AM   #2
acid_kewpie
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one command a year? That's slow progress... ;-)

are the partitions still defined as raid in fdisk?

AFAIK you shouldn't need a mdadm.conf file at all, as all the metadata is stored in the partitions. Mind you the zero-superblock should cover that too... did you try a "--force" with it to be sure?
 
Old 02-06-2012, 04:58 AM   #3
daisychick
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heh. Yeah, I like my RAID old school. And doh. I forgot about the partitions. Let me wipe them and I'll go from there. That should do the trick though.
 
Old 02-06-2012, 05:05 AM   #4
daisychick
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ok, explain this one... I wiped the partitions and set them to plain linux instead of raid and the array still comes up as active oO

Code:
jess@NAS:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb1[1]
      1953511936 blocks [2/1] [_U]
 
Old 02-06-2012, 05:08 AM   #5
daisychick
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it's still showing a mdadm superblock...
Code:
jess@NAS:~$ sudo mdadm -E /dev/sdb
/dev/sdb:
          Magic : a92b4efc
        Version : 0.90.00
           UUID : 306e2114:444e0ff2:cced5de7:ca715931 (local to host NAS)
  Creation Time : Wed Jan 26 19:37:42 2011
     Raid Level : raid1
  Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB)
     Array Size : 1953511936 (1863.01 GiB 2000.40 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 0

    Update Time : Sun Feb  5 21:47:36 2012
          State : clean
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0
       Checksum : c626adbc - correct
         Events : 4380


      Number   Major   Minor   RaidDevice State
this     1       8       16        1      active sync   /dev/sdb

   0     0       0        0        0      removed
   1     1       8       16        1      active sync   /dev/sdb
 
Old 02-06-2012, 05:10 AM   #6
daisychick
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tried

sudo dd if=/dev/zero of=/dev/sdb bs=512 count=1
 
Old 02-06-2012, 05:19 AM   #7
daisychick
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jess@NAS:~$ sudo mdadm -E /dev/sdb
mdadm: No md superblock detected on /dev/sdb.

and yet the array persists...
 
Old 02-06-2012, 05:23 AM   #8
daisychick
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I got it!

mdadm --misc --zero-superblock --force /dev/sdb
 
  


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