[Bug 1028677] Re: mdadm should be used for fakeraid (instead of dmraid)

[Sergio Callegari]

At the moment mdadm with imsm metadata is totally broken on xenial (and
I suspect on all ubuntu distros with systemd). Due to incorrect ordering
of things at shutdown machines with arrays assembled at boot with mdadm
and imsm metadata may hang and the array is resynced everytime even if
the bios shows it being in a normal state.

See bug 1320402, bug 1587142

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https://bugs.launchpad.net/bugs/1028677

Title:
  mdadm should be used for fakeraid (instead of dmraid)

Status in debian-installer package in Ubuntu:
  Invalid
Status in mdadm package in Ubuntu:
  Invalid
Status in partman-md package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Invalid

Bug description:
  mdadm now support external metadata and can hadle fakeraid better than dmraid:
  https://raid.wiki.kernel.org/index.php/RAID_setup#External_Metadata
  http://download.intel.com/design/intarch/PAPERS/326024.pdf

  It seems that dmraid is no more developed (only maintenance), so
  ubuntu should use mdadm instead of dmraid for fakeraid.

  Actually, it's not possible to setup a new ubuntu install with mdadm
  fakeraid (tried 12.04 and 12.10 alpha 2 alternate cd): only dmraid is
  offered.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: mdadm (not installed)
  ProcVersionSignature: Ubuntu 3.0.0-23.39-generic 3.0.36
  Uname: Linux 3.0.0-23-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  Date: Wed Jul 25 00:45:56 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: mdadm
  UpgradeStatus: Upgraded to oneiric on 2012-07-07 (17 days ago)

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