[Bug 371338] Re: cannot stop RAID1

[Andrew Cranwell]

Is this still affecting 10.04? I managed to fix my 8.04 system with a
reboot.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to mdadm in Ubuntu.
https://bugs.launchpad.net/bugs/371338

Title:
  cannot stop RAID1

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: mdadm

  Ubuntu 8.04.2, i386, server

  Cannot stop RAID1 device. I do a disk cleanup and I want to replace
  RAID1 device with RAID10 device. I cannot stop RAID1 device. /dev/md1
  was used as a swap, but swap is "off" now.

  # cat /proc/mdstat
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
  md2 : active raid5 sda5[0] sdd5[3] sdc5[2] sdb5[1]
        879100416 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
        [==>..................]  resync = 11.6% (34281344/293033472) finish=251.8min speed=17120K/sec
        
  md1 : active raid1 sdb3[1]
        979840 blocks [2/1] [_U]
        
  md0 : active raid1 sda1[0] sdb1[1]
        8787456 blocks [2/2] [UU]
        
  unused devices: <none>

  # free
               total       used       free     shared    buffers     cached
  Mem:        515436     131576     383860          0       8632      69280
  -/+ buffers/cache:      53664     461772
  Swap:            0          0          0

  # mdadm --stop /dev/md1
  mdadm: fail to stop array /dev/md1: Device or resource busy

  # mdadm /dev/md1 --fail /dev/sdb3
  mdadm: set /dev/sdb3 faulty in /dev/md1

  # mdadm  /dev/md1 --remove /dev/sdb3
  mdadm: hot remove failed for /dev/sdb3: Device or resource busy

  # mdadm --stop -v /dev/md1
  mdadm: fail to stop array /dev/md1: Device or resource busy

  My observation is that most documentation focus on creation of new
  RAID devices but there is only little information about destruction of
  RAID devices (that is needed sometimes...). I want to delete /dev/md1
  and create new /dev/md1 that will be RAID10 type. Should be an easy
  task but I met an issue I cannot overcome...

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/371338/+subscriptions