After reading about that issue, it seems that your card is not a real
hardware RAID controller (which are generally expensive because the
controller itself take care of everything, and ubuntu only see the final
RAID drive if it has drivers for this controler). In your case, the
Promise FastTrak TX2300 raid controller is a software RAID, which means
that the card is almost nothing more than two SATA port, with a software
from the constructor to make it "looks like RAID".

Even with drivers for this device, it should not be a surprise that
ubuntu show you the drives and not a "RAID array", because it the real
world there os no real RAID at all, so ubuntu is pretty accurate. The
reasons why ubuntu won't use the software RAID provided by the
constructor is simply that all cards have their own softwares, which
works differently and there is no standard, this means a lot of
potential problems : useless and hard to maintain softwares and drivers
not supported by their constructor and no solution or support in case of
failures or problems. So you can choose to download drivers from the
constructor and try to install them, but your experience is very likely
to be horrible.

Fortunately, you don't need this at all to operate a software RAID on
Linux. Any controller connected on your system can have hard drives that
can be used to create new RAID arrays, no matter where the drive is
connected (on your motherboard controller, your FastTrak raid
controller, even USB hard drives (but that would not be a good idea
after all) :-) All RAID levels are available, depending on what you want
to create, and the performances will be exactly the same with Linux own
software RAID than with the software provided by your RAID controler.

If you want to start playing with RAID, you can have a look at mdadm here :
https://help.ubuntu.com/community/Installation/SoftwareRAID

** Changed in: ubuntu
       Status: New => Invalid

-- 
Cant see volume/disk on Promise FastTrak TX2300 raid controller
https://bugs.launchpad.net/bugs/342614
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