I already talked about this problem hundreads of times, I was an avid
supporter of RAID devices, being using them since 6 to 8 years now.

Ive stopped using RAID last year because toons of problems with Ubuntu.

First we have the terrible idea to simply ignore the HPA (which is a
setting that no OS ignores, except for Ubuntu) that alone destroyed my
Matrix RAID array a lot of times.. then we have the DMRAID bugs that
prevents detecting the secondary subset on Matrix RAID sets.. (both of
this bugs are still present on Karmic even as of July 20).


LiveCD should have an option to directly boot with the HPA active and not 
ignoring it or at least ASKING the user or adding an option in the LiveCD to 
change it "via kernel option"  (just like the rest of commands added to boot).

This could be easily implemented if the main Boot screen before booting
LiveCD offers a single "option" saying "boot for RAID systems"  or
something like that, that pass the command libata.ignore_hpa=0 so the
system could boot the LiveCD without breaking a RAID array.

THEN you could ADD the option to Install on RAID Systems to ubiquity so
the installer is AWARE there is a raid array on the system an properly
install dmraid package and recognize it.

It is a shame this was in my whishlist since feisty and here we are and
RAID support is non-existant in Ubuntu, furthermore this is terrible if
we consider that Vista and Windows 7 included RAID support for all major
controllers since Service Pack 1 so, installing and using RAID on that
systems is pretty much transparent to the user.

-- 
dmraid / FakeRAID support should work automatically in installers.
https://bugs.launchpad.net/bugs/90235
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