[Bug 1779685] Re: [18.04.1] Backport support for Intel VROC arrays in mdadm

[Dimitri John Ledkov]

Cannot test IMSM installation, as new qemu/ovmf/something is preventing
me to access intel matrix raid in the UEFI VM now. It used to work,
however. Will investigate separately.

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https://bugs.launchpad.net/bugs/1779685

Title:
  [18.04.1] Backport support for Intel VROC arrays in mdadm

Status in mdadm package in Ubuntu:
  Fix Released
Status in mdadm source package in Bionic:
  Fix Committed
Status in mdadm source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

   * mdadm as shipped in 18.04.0 does not support Intel VROC arrays, as
  to be shipped over Bionic LTS lifecycle in multiple
  laptop/desktop/server SKUs by multiple OEMs.

   * this is a request to backport mdadm master, with support of Intel
  VROC arrays, and subsequent compiler fixes, and reshaping fixes, to
  fully support VROC arrays (including reshaping).

  [Test Cases]

   * Ensure existing Intel IMSM raids continue to assemble, boot, shutdown cleanly, bootable when degraded.
   * Ensure existing linux raids continue to assemble, boot, shutdown cleanly, bootable when degraded.
     - with 0.90 metadata; 1.0 metadata; 1.1 metadata; 1.2 metadata
   * [Optional] ensure that DDF raids continue to assemble, boot, shutdown cleanly, bootable when degraded.
   * Validate installers onto Intel IMSM raids
   * Validate installers onto Linux RAID
   * Validate bare-metal public clouds that use mdadm

  [Regression Potential]

   * Worst case scenario is failing to start assembled array in rw mode,
  on boot. This would result in dropping into emergency shell/mode in
  either initramfs, or emergency.target requiring manual intervention by
  a sysadmin to recover and start synced raid array. However, the test
  cases above should cover this regression potential adequately.

   * Other changes, to resizing/reshaping may result in failure to
  resize/reshape, but these are rare maintenance operations for which
  one should have a backup - or able to recover from such an operation.

  [Other Info]

   * xnox offline 7th July - 16th July

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