dmraid broken for large drives
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
mdadm (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
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.
How does one migrate from dmraid to mdadm when using IMSM?