Raid5 on new kernels.

[James McEvoy]

Hi Anders,

The raid456 kernel module is part of the software raid used my mdadm.  The
RAID 5 support in the isw driver is still under development by Intel.  You
may be able to get it to work if you get the latest isw source from cvs but
I do not think it is ready for production yet.

If I remember right: when I installed Fedora 7 anaconda had a newer version
of isw then the system did when it booted normally or it would have been
that dmraid was configured better in anaconda than the regular kernel.

I ended up not configuring the drives for RAID in the bios by setting them
to AHCI mode using software RAID (mdadm).  Make sure that you remove the
RAID labeling from the disks before trying to use software RAID.  You can
remove the labels with the bios or using the dmraid utility... I found that
the dmraid utility does a better job.

The main reason I ended up using mdadm for my system is that the isw driver
that came with Fedora 7 would recognize and configure RAID 0+1 or mirrored
in my ICH8R chipset but the isw driver would not rebuild a new disk when I
replaced it.  I needed to use RAID 5 and did not have enough 500 gig disks
to test a cvs version of isw in RAID 5 mode.

I do not know if a working isw driver for Intel RAID will preform better
than mdadm RAID with the disks in AHCI mode but I feel safer using the well
tested mdadm software RAID.

  --jim

On 7/22/07, Anders Aagaard <aagaande at gmail.com> wrote:
>
> Hi
>
> I've been desperately trying to setup dmraid raid5 on a recent kernel
> since last night.
>
> My problem is that my chipset (ICH9R) is only supported on recent kernels,
> and the dmraid patches for raid5 seems to only work on older kernels.
>
> Is there any way I can get dmraid to use the raid456 module provided by
> new kernels?  Or any patch available to for 2.6.21/2.6.22 for dmraid's
> raid5 module?
>
> I desperately need this up and running before monday, any help would be
> highly appreciated.
>
> Anders
>
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