Public bug reported:
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.
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1054948
Title:
dmraid broken for large drives
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