[Bug 1054948] Re: dmraid broken for large drives

[Dmitrijs Ledkovs]

On 24 September 2012 15:46, Jan Kleinsorge <jan.kleinsorge at gmail.com> wrote:
> If co-existence of dmraid and mdadm would be just an incremental step
> for later versions, exclusive-or would at least a step forward for mdadm
> and I would be happy to test that (isms root + shutdown).
>

Ok. I will ping you, after I have something ready. Probably without
the installer though....

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Title:
  dmraid broken for large drives

Status in “mdadm” package in Ubuntu:
  New

Bug description:
  Attempting to set up a fresh Quantal system on a system with Intel 'fakeraid' (imsm, 1.3) and 3TB SATA RAID1. When running the live CD, dmraid identifies the drives as being of size 746GB (Same effect with a Windows 7 setup without loading the corresponding Intel drivers prior to partitioning). 
  dmraid -an does not release the mappings. The work-around for the installation is to boot with nodmraid, install mdadm and assemble manually prior to starting the installation. dmraid seems to be severly broken for a pretty much standard PC setup. 
  mdadm can handle Intel imsm firmware-backed RAID just fine. 

  After installation, several measures still have to be taken when the system /root is also part of that array/. See #1054773 and references for major issues regarding this.
   
  SInce mdadm is actively supported by Intel and dmraid is at best in a maintenance state, deprecation of dmraid in favor of mdadm would be welcome.

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