Re: Setting up raid correctly

[Philip Mueller <spectre2%gmx.de@localhost>]

On 24.02.2013 16:11, Manuel Bouyer wrote:
> On Sun, Feb 24, 2013 at 05:00:07PM +0000, Philip Mueller wrote:
> > If I partition wd3 single, then I can't setup a raid1 on it.
> > Because:
> > spectre# dd if=/dev/zero of=/dev/wd3d
> > ^C8457+0 records in
> > 8456+0 records out
> > 4329472 bytes transferred in 3.467 secs (1248766 bytes/sec)
> > spectre#gpt show wd3
> >         start        size  index  contents
> >             0  3907029168
> > spectre#gpt create wd3
> > spectre# gpt add -t ffs wd3
> You didn't understand what I wrote. You have to create the partition on wd3
> *after* setting up the raid1 and creating the filesystem on it.
> The start of the partition on wd3 has to match the location of the ffs
> on raid1, shifted by the raid1 metadata, which, I think, is 128 sectors.
> Also, you may have to create a raid-type partition on wd3 so that
> the partition table on wd3 and the raid1 metadata don't overwrite each other.
> This means you'll have 2 overlapping partitions on wd3, one to be used by
> raid1 and another one to be used to mount the ffs.
Ok, this is a little much for me.
Can we take this step by step?
1.) undo all configurations
spectre# raidctl -uv raid1
spectre# gpt destroy wd3d
spectre# dd if=/dev/zero of=/dev/wd3
^C408832+0 records in
408831+0 records out
209321472 bytes transferred in 5.371 secs (38972532 bytes/sec)

1.) wd3 is empty, now create raid1 on empty wd3
spectre# raidctl -C /etc/raid1.conf raid1
spectre# label=`date +%Y%m%d%H%M`
spectre# raidctl -I $label raid1
spectre# raidctl -i raid1
Initiating re-write of parity

Is this right so? What do I next, create partition on raid1 or newfs on 
raid1 or both or destroy raid1 and partition wd3?