[Bug 1077650] Re: booting from raid in degraded mode ends in endless loop

[Denis Manente]

It also affects ubuntu server 13.04 64bit with raid5 device.
I think this bug should be classified 'High importance' cause it prevent server usage until the raid device is completely rebuilt.
In my configuration with 3 x 3Tb discs in raid 5 the complete rebuild can take 8 hours at standard speed.
But also few hours are a totally inacceptable time period in a production environment.

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https://bugs.launchpad.net/bugs/1077650

Title:
  booting from raid in degraded mode ends in endless loop

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  Its basically the same as reported here:

  http://efreedom.com/Question/6-103895/Can-Boot-Degraded-Mdadm-Array

  So I just installed a new system, which is supposed to get later on an
  additional disk. For now I created md raid1 devices with one disk
  missing. To get ubuntu booting at all without complaining about a
  missing disk I already added "bootdegraded=yes" to the kernel command
  line. And now it ends in an endless loop of

  unused devices: <none>
  Attempting to start the RAID in degraded mode...
  mdadm: CREATE group disk not found
  Started the RAID in degraded mode.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: initramfs-tools 0.103ubuntu0.2
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu3
  Architecture: amd64
  Date: Sun Nov 11 16:26:55 2012
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: initramfs-tools
  UpgradeStatus: Upgraded to quantal on 2012-01-08 (308 days ago)

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