10.04.1 LTS install with RAID support?

[Steve Malenfant]

On Fri, Jan 28, 2011 at 2:20 PM, Tom H <tomh0665 at gmail.com> wrote:

> On Fri, Jan 28, 2011 at 12:25 PM, Steve Malenfant <smalenfant at gmail.com>
> wrote:
> > On Fri, Jan 28, 2011 at 12:11 PM, Tom H <tomh0665 at gmail.com> wrote:
> >> On Fri, Jan 28, 2011 at 12:06 PM, Steve Malenfant <smalenfant at gmail.com
> >
> >> wrote:
> >> > On Fri, Jan 28, 2011 at 11:47 AM, Alan Pope <popey at ubuntu.com> wrote:
> >> >> On 28 January 2011 14:38, Steve Malenfant <smalenfant at gmail.com>
> wrote:
> >> >>>
> >> >> > Not yet. The problem is that I don't have any writable CD anymore.
> >> >>
> >> >> I specifically meant use the netinst ISO on a usb stick using
> >> >> unetbootin. I used this last week, and believe you won't get the CD
> >> >> mount issue because the mini/netinst iso doesn't grab packages from a
> >> >> local CD repo but from online.
> >> >>
> >> >> But it looks like you're sorted now :)
> >> >>
> >> > Sorted, not really. I believe my main problem is that these drives had
> >> > already an Soft RAID config on them. I'm trying to re-purpose them.
> But
> >> > the
> >> > installation can't remove the RAID configuration. It would be nice to
> >> > have
> >> > an option to remove all RAID partitioning before the partitioning
> >> > happen.
> >> > Anyway, I tried removing that stuff with Gparted... failed. mdadm
> >> > --zero-superblock fails. So.. waiting for the long dd -if=/dev/zero on
> >> > them
> >> > and hopefully this md2 array won't show up on next install!
> >> > Is this supposed to be that complicated?
> >>
> >> There's no reason why
> >> mdadm --zero-superblock <every_mdadm_partition>
> >> wouldn't work.
> >>
> >> It's definitely the way to go.
> >>
> > I thought it was too.. But there is something you guys didn't know (I
> didn't
> > either!). Well.. I tried fakeraid with the nvidia MCP... Well, it wrote
> > something on there which dmraid detected... It asked me during the
> > installation if I wanted to load the "SATA RAID". Of course I said "no".
> But
> > the install detected it anyway. So, to remove you have to do "dmraid
> -rE".
> > Just something I tried from other forums... Then it told me : Do you want
> to
> > remove the tag nvidia blabla bla... That's where I knew that Nvidia RAID
> was
> > interfering even after being disabled.
> > I'm not out of the woods yet. I created my partitions manually on both
> > drives but the "Configure software RAID" won't bring up my MD RAID1
> > partition to assign the "/" partition and doesn't show anywhere. I'll try
> > another reboot for that.
>
> "There's no reason..."! :)
>
> There is because the disk were written by the nvidia MCS and mdadm did
recognize but couldn't destroy it. I had to use dmraid to remove the
metadata.
I don't know... :) But it is installing slowly and syncing the Array now..
You will probably have no problem with a brand new VM partition like I did
here with my 1.5TB drives.

The reboot was needed between the partionning the hard drive and creating
the arrays. The sdaX and sdbX partition were just not available in /dev.
Only /dev/sda and /dev/sdb were present. A reboot fixed that.


> When you referred to "Soft RAID" I assumed mdraid not dmraid...
>
> There apparently is: dmraid's involved.
>
> The latest installers are pretty aggressive in using dmraid because
> dmraid support's been bad in the past...
>
> dmraid's got a command similar to mdadm's "--zero-superblock";
> "--erase-metadata"? (IIRC!)
>
> mdadm can now manage dmraid arrays but I guess not to the extent of
> zeroing metadata.
>
> I'm downloading a server iso to install it in a VM because I don't
> understand why you couldn't set up mdraid through the installer - and
> I don;t see why you have to reboot for an mdraid array to be
> recognized by d-i.
>
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