Re: [gentoo-user] Creating RAID devices - udev question

[Brian Parish <bmp@univexsystems.com>]

On Sunday 13 November 2005 17:33, Brian Parish wrote:
> On Sunday 13 November 2005 17:23, Richard Fish wrote:
> > On 11/12/05, Mike Williams <mike@gaima.co.uk> wrote:
> > > On Sunday 13 November 2005 01:49, Brian Parish wrote:
> > > > I am trying to add a software RAID 5 disk set to an existing machine
> > > > installed using genkernel. All the RAID support is compiled into the
> > > > kernel, but no /dev/md? device files exist. I can create these using
> > > > mknod and make the RAID, but they don't survive a reboot. How do I
> > > > tell udev to create these files as persistant devices?
> > >
> > > All partitions in the RAID set need to be set to partition type fd
> > > (Linux raid autodetect), then the kernel will build the arrays during
> > > startup.
> >
> > FYI, this is only true if the raid drivers are compiled into the
> > kernel (no modules), and you do _not_ use an initramfs to boot the
> > system.  If you use an initramfs, the kernel skips the autodetection
> > of raid arrays.
> >
> > -Richard
>
> I did and it does (skip that is).  Thanks again Richard.
>
> Brian
Removing the initramfs seemed like the line of least resistance here, so being 
basically lazy, that's what I did.  /dev/md0 is now created and I can create 
my RAID array happily enough.

This still doesn't survive a reboot though.  i.e. I have to run the mdadm 
--create command again.  I assumed that this required something in 
mdadm.conf, so I updated that with all the magic numbers shown by mdadm -D.  
No change though.  Is this an rc-update issue, or something?

Thanks yet again
Brian
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