[Bug 942275] Re: Bitmap creation in 12.04 failed.

[Brian Candler]

I think this is known bug in mdadm 3.2.3, fixed in git upstream:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=664088


** Bug watch added: Debian Bug tracker #664088
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=664088

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https://bugs.launchpad.net/bugs/942275

Title:
  Bitmap creation in 12.04 failed.

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  Created a 4x3TB raid6 without bitmap. Regretted my error and afterwards tried to create the bitmap. Creation of bitmap failed.
  (Yes its stupid with 4x3TB in RAID6 but it will be expanded in the futured with XFS).

  I tried to create/delete and so on and so forth and noticed that I
  could never create a bitmap on 12.04 without updating to GIT-version
  "newest" (around 20-23feb-12) of MDADM. After using the GIT-version of
  mdadm and use that to create bitmap it went fine. No problems
  whatsoever. However when rebooting the array will autocheck. Probably
  because I didnt make install (wanted to keep the 12.04 "untouched") so
  it ran with older mdadm during boot. And bitmap was faulty again. Even
  reboot/shutdown didnt complete (froze) and even if I did "clean
  reboot" with alt-prntscrn-RSKINUT it wouldnt work.

  Repeted this experience 2-3 times before I figured it wouldnt work. I
  can add/remove bitmap without any issues (with the GIT-version) as
  long as I dont reboot. As soon as I reboot it fails and it will
  recheck array again.

  Leaving bitmap unset works fine. I can reboot loads of time without
  any issues whatsoever.

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