Comment 7 for bug 568183

Attempted to recreate this failure and was unable to do so.

Following as closely as I could to Alvin's description, I had a system running Karmic with a root partition and a second data partition. I moved all data from the data partition to a safe location. I added two disks and using mdadm created a 3 disk software RAID 5 array, mounted that, and moved my data onto the newly created array.

I rebooted to verify the array was intact after a reboot and autostart, and verified that the test data was still present.

I then did a Lucid Install to this system, installing to the first partition on sda (again, recreating Alvin's description step by step).
Of note, partman did NOT indicate that my existing RAID partitions were ext4, in fact, it showed nothing for their type.

Lucid install completed successfully, and afterwards I was able to rebuild the array, configure my new Lucid install to automount that array and was able to verify that my original data (which lived on the array throughout this new install process) was still there and viable.

The only thing I saw of note was that, on rebuilding the array after the Lucid install, mdadm showed the array started in a degraded state with the first two partitions as active, and the third as a spare in a rebuilding state. Once the rebuild was complete, everything seemed just fine.

So unable to confirm, and unable to recreate on my end.