Greg Freemyer wrote:
> Richard,   (I'm top posting intentionally).
>
> I'm confused, you said previously you were never going to run windows
> on the box, so why are you researching the windows / linux
> compatibility dm-raid driver?
>
It has nothing to do with Windoze.   It has to do with the fact that I
want to use the 4 drive RAID5 hardware (fake-raid) drive as my system
drive which would act as a large drive containing MBR, /boot, /, /home,
/var, /everythingelse amounting to 1.09TB utilizing the 4x400G SATA
drives (which is all the MB can directly control).    In order to get
*something* up, I salvaged an old 120G IDE drive because the MB has an
IDE controller also and put the CDRom and 1IDE HD as a (hopefully
temporary) bootable system.   It is looking like I can't use the MB
fake-raid drive array as a boot device under  SUSE even though I could
if I were to degrade the system and use Windoze.    I would rather throw
the system in to the trash than to use M$ products, so I will use the
5th drive unless I can find a way to boot from the 4 drive hardware
fake-raid array.   If I am ever successful, I will deploy the
configuration, if not, it isn't yet quite economical to require 5 drives
when 4 *should* do the job (and would if I didn't hate M$ so much).   

> ie.
> md-raid - native linux software raid.  Does not support fake-raid
> bios, but talks directly to the drives.  Raid setup is maintained in a
> linux generic way.  Lots of users so it is easy to get answers and
> Howto info.
>
I have not been able to find how to do this DURING INSTALLATION.   I can
create the software array but I am warned that it will NOT be bootable
nor can a MBR be created nor can a swap partition be created because
until the boot is complete, the software array is not
available/stable.   That is the warning message I get (and heed).   I
can install to a 5th drive and create the array, but this is a 5 drive
solution to a 4 drive problem.

> dm-raid - linux fake-raid driver.  Reads raid config info from the
> controller bios.  Because every fake-raid controller has a seperate
> api, it has specialized api modules for each controller type.  Since
> it is in no way generic, it has lots more code and is much less well
> tested than md-raid.  Also, you will find it harder to ask questions
> and get reliable answers.
>
If a driver exists and can be loaded at boot time, then the fake-raid
controller solution is the right way to go in this case.  There are
drives available for several (Adaptec comes to mind) controllers I have
seen that can be loaded during installation.   I am hoping a suitable
driver exists for this ASUS board.

> To the best of my knowledge, md-raid is highly preferred unless you
> need to be able to dual boot your machine.  In the case of a dual
> boot, windows uses the controller bios to setup the raid, so you need
> dm-raid to ensure linux sees the same raid array the windows does.
>
> I believe md-raid is supported directly during opensuse 10.2 install,
> so if you go that way you don't have any research / work to do.  Just
> use it.
> <snip>
Any ideas on how to use the 'fake-raid' during the install AS A BOOT
DEVICE would be appreciated.   As I stated, I can't see how to use it as
the root device or boot device, only as a data device.

Thanks,
Richard

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