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

[Michał Żyłowski]

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 <email address hidden>
"imsm: add functions to get and set imsm dev size" fcc2c9daede11fcc67e4032fd6fa8da198aaa319 by Mariusz Dabrowski <email address hidden>
"imsm: pass already existing map to imsm_num_data_members" 9529d3436771d9f38884861683dee3b40ab9d180 by Mariusz Dabrowski <email address hidden>
"imsm: do not use blocks_per_member in array size calculations" 444909385fdaccf961308c4319d7029b82bf8bb1 by Mariusz Dabrowski <email address hidden>
"imsm: correct num_data_stripes in metadata map for migration" 4a353e6ec48e35437b27978add6cd2cd015f2cfe by Roman Sobanski <email address hidden>

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

[Dimitri John Ledkov (xnox)]

This bug needs to be public, for me to reference in the changelogs for auto-closing and the SRU process.

[Dimitri John Ledkov (xnox)]

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

[Launchpad Janitor (janitor)]

This bug was fixed in the package mdadm - 4.1~rc1-4

---------------
mdadm (4.1~rc1-4) unstable; urgency=medium

  * Cherrypick master patches up to 20th of July 2018. LP: #1781427
  * Make safe-timouts udev rules compatible with usr-split systems.

 -- Dimitri John Ledkov <email address hidden> Mon, 23 Jul 2018 11:48:50 +0100