No F21 on Intel BIOS RAID? Workaround?

[Chris Murphy]

On Thu, Dec 4, 2014 at 12:21 PM, Ian Pilcher <arequipeno at gmail.com> wrote:
> I just tried to install RC5 on my home system, which uses Intel BIOS
> RAID, and anaconda crashed during its initial storage scan.
>
>   https://bugzilla.redhat.com/show_bug.cgi?id=1170755
>
> Short of major surgery (pulling the RAID drives, breaking the RAID,
> etc.), can anyone think of a way to get F21 installed on this system?

When booted from any install media, in a shell, what do you get for:
cat /proc/mdstat
mdadm -D /dev/md126
mdadm -E /dev/sd[ab]

>From the program.log, I'm seeing sd[ab]5 are bcache partitions, and
looks like they're outside of the imsm container, is that correct? I
don't know whether this is a supportedlayout, my expectation when
using firmware RAID is that the firmware (and later the md driver)
asserts complete control over the entire block device. Any partitions
are created within the container. If that's correct, the bcache
partitions would need to be inside the imsm container as well. But in
any case the installer shouldn't crash, it should inform. The version
of mdadm in F21 is the same for three months, so if there's a
regression here it's not recent.

-- 
Chris Murphy