[Bug 1781427] Re: [INTEL UBUNTU 18.04/18.10 BUG] Wrong size after OLCE of IMSM Volume

[Dimitri John Ledkov]

I see no private information posted to this bug, therefore making it
public.

** Information type changed from Private to Public

** Also affects: mdadm (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: mdadm (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1781427

Title:
  [INTEL UBUNTU 18.04/18.10 BUG] Wrong size after OLCE of IMSM Volume

Status in mdadm package in Ubuntu:
  New
Status in mdadm source package in Bionic:
  New
Status in mdadm source package in Cosmic:
  New

Bug description:
  
  Steps to reproduce:

  1. Create RAID volume using PreOS environment.
  2. Boot to OS.
  3. Add additional drive(s) to an IMSM array using command: mdadm --add /dev/imsm0 /dev/sd[a-z] drives with capacity greater or equal smallest drive capacity used in IMSM array
  4. Execute grow command on array with additional drives: mdadm --grow /dev/md/imsm0 --raid-devices=N Where N is number of drives after resizing
  5. Check if volume on IMSM array was proportionally resized.

  
  Expected results:
  Raid volume after OLCE should have proper size.

  Actual results:
  Raid volume size didn’t change after OLCE.

  
  This bug is fixed in upstream by few patches. They have to be applied to ubuntu mdadm package.

  List of necessary patches:
  "imsm: change reserved space to 4MB" 611d95290dd41d73bd8f9cc06f7ec293a40b819e by Mariusz Dabrowski <mariusz.dabrowski at intel.com>
  "imsm: add functions to get and set imsm dev size" fcc2c9daede11fcc67e4032fd6fa8da198aaa319 by Mariusz Dabrowski <mariusz.dabrowski at intel.com>
  "imsm: pass already existing map to imsm_num_data_members" 9529d3436771d9f38884861683dee3b40ab9d180 by Mariusz Dabrowski <mariusz.dabrowski at intel.com>
  "imsm: do not use blocks_per_member in array size calculations" 444909385fdaccf961308c4319d7029b82bf8bb1 by Mariusz Dabrowski <mariusz.dabrowski at intel.com>
  "imsm: correct num_data_stripes in metadata map for migration" 4a353e6ec48e35437b27978add6cd2cd015f2cfe by Roman Sobanski <roman.sobanski at intel.com>

  All patches are accepted in upstream and pushed:
  https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/log/

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