Re: Raid5 on new kernels.

Hm, that's really unfortunate.  I bought this motherboard to replace another
one, to get the ICH9R, figuring it'd be well supported (intel is generally
fairly safe, and I knew about dmraid's existance, and I've used it with
raid0 before).  And while this was software raid before, this computer now
has to act as a driver testing system as well, which is why it needs a dual
boot setup with different versions of windows, so linux software raid is a
bit out of the picture.

Could you point me at the dmraid/isw cvs tree's?  I've been looking around a
bit and been unable to find them.  And I'll atleast read the cvs log to see
how experimental it'd be.

On 7/22/07, James McEvoy <[email protected]> wrote:
>
> 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 <[email protected]> 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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> >
>
>
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