2011/5/25 Tom H <[log in to unmask]>

> On Wed, May 25, 2011 at 7:05 AM, Florian Philipp <[log in to unmask]>
> wrote:
> > Am 25.05.2011 12:45, schrieb Zack Yovel:
> >> 2011/5/25 Florian Philipp <[log in to unmask]
> >> <mailto:[log in to unmask]>>
> >>     Am 25.05.2011 07:29, schrieb Zack Yovel:
> >>     > Install SL6 on RAID 0 on GA-890GPA-UD3H (chipset: AMD SB850 )
> >>     >
> >>     > Does anyone know of a raid driver for this motherboard or chipset?
> >>
> >>     Any particular reason why you invest effort in using the onboard
> RAID
> >>     instead of just using software raid (md subsystem instead of dm)?
> >>     Onboard RAID gives you negligible or even negative performance gains
> and
> >>     locks you in on their disk format.
> >>
> >>     Regards,
> >>     Florian Philipp
> >>
> >> I almost feel like I do something wrong :)
> >> I want onboard RAID because I want everything raided and I plan a
> >> dual-boot with windows server. I believe software RAID of either linux
> >> or windows will make it impossible to install the other system on the
> >> raided partitions. I would create half of the storage raided in linux
> >> and half in windows, but at least windows raid requires converting the
> >> hole two disks to dinamic, which will prevent my from installing any
> >> other OS on either of them.
> >>
> >> In short - I have two disks, I want them both on raid 0, and I want
> >> dual-boot with windows.
> >> If hardware RAID isn't the best solution for this, I'll be happy to
> >> learn of another one..
> >
> > Well, in that case, onboard RAID really is your only option unless you
> > a) invest money in a real hardware RAID controller
> > b) replace dual-booting with virtualization
> >
> >> Excuse my noobish questions, but what do you mean by "md subsystem
> >> instead of dm" and by "locks you in on their disk format"? are you
> >> talking about MBR vs. GPT?
> >
> > MD is the kernel subsystem for software RAID. Device mapper (or dm) is
> > used for onboard RAID, among other things. In the kernel, they use the
> > same code-base but their interfaces and purposes are different.
>
> You can use mdraid/mdadm to control dmraid/biosraid/fakeraid using
> "container" in mdadm.conf (I've never done so but know that it's
> possible). So if you have to dual-boot Windows and SL and are using
> bios-/fake-raid on the Windows side, you have to use bios-/fake-raid
> on the SL side.
>
> Whether you use dmraid or mdadm to manage the array, you still need
> the appropriate dmraid driver. If the SL CD/DVD isn't detecting your
> dmraid, I'd suggest that you boot from an Ubuntu Live CD, find out how
> it's detecting and assembling the dmraid (since 10.10, these CDs have
> had pretty aggressive dmraid capabilities and you users are asking how
> to disable the detection in order not to use dmraid at install time),
> and find and use the SL equivalent.
>

Problem is both SL and Ubuntu recognize my raid array as mirror, instead of
RAID 0.