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

[Antonio]

Public bug reported:

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)

** Affects: mdadm (Ubuntu)
     Importance: Undecided
         Status: New

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

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

Status in “mdadm” package in Ubuntu:
  New

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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