Raid Supported 8.04 ?

[Frederic Schaer]

Hi,

Rick a écrit :
> Was looking to update my hard drives (internal)
> to 2 (1 tb size) but have on -board  Intel's raid controller chip
> ICH9R
>
> Can one Raid the two drives, ( 2TB ) then install Vista,
> then install (K)ubuntu (resize) 1.9 TB for (K)ubuntu to use,
> and have 100 Gigs for Vista.
>   
No, I fear
>
> So, my first question, does (K)ubuntu support this kinda of
> Raid Chip.
>   
Yes, probably.

I explain : most motherboard raids are "soft raids", compared to true
raids you can find on raid cards.
When you setup your raid in the bios, and enter linux, then linux sees
all the disks separately.

This is like this on my ICH8R, I guess it's the same for the ICH9...

Still, there is a kernel module that allows you to see your bios raid in
linux : dmraid.
If you do "modprobe dmraid" (dmraid needs lvm modules) then you'll
probably be able to see your raid "drive" and partitions in
/dev/mapper/iswjhsqlkjfh (name is weird and depends on the chipset)

That said, I once tried to use the alternate installation method in
Kubuntu 7.10 , went to a shell, modprobed the dmraid modules, saw the
drives, but was unable to make the installer see the dmraid partitions.
Well, it saw those partitions once, but I was not able to install,
things went very bad. Maybe situation changed for Hardy (I just upgraded
from Gutsy to Hardy, so I don't know for sure)...

Another thing that might go wrong is the grub installation, because
you'll need to be able to tell grub to use the /dev/mapper/blah drive,
and I'm not really sure this would work or that it's even possible :
when I open a grub shell in linux, I only see my physical drives. There
may be a solution that would be to start grub and tell it not to probe
for BIOS drive, give it the drives map directly, and then install it,
but I'm certainly not going to give you advice to do that : it's far too
tricky, and if you ever have a problem, you're in a very bad situation.

My advice would be : have 900 Gigs use a native linux soft raid, and
create a soft raid in windows also (it is possible in the disk manager,
if I remember well - it's not called "soft raid", but I'm sure google
will help you ;) )

Regards

>
> Major Thanks x 2
> Richard
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