Re: Setting up raid correctly

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sun, Feb 24, 2013 at 08:41:53PM +0000, Philip Mueller wrote:
> On 24.02.2013 18:41, Manuel Bouyer wrote:
> >On Sun, Feb 24, 2013 at 07:27:19PM +0000, Philip Mueller wrote:
> >>[...]
> >>What is the next step?
> >>Create gpt+ shifted partition?
> >create a gpt partition on the raid volume a newfs it.
> >then create a second gpt partition on wd3, type ffs, which is the
> >same size as the gpt partition on the raid, but with start shifted
> >by 64 or 128 sectors (I though it was 128 but David may be right about it
> >being 64).
> >
> spectre# gpt create raid1
> spectre# gpt add -t ffs raid1
> Partition added, use:
>         dkctl raid1 addwedge <wedgename> 34 3907028925 <type>
> to create a wedge for it
> spectre# dkctl raid1 addwedge dk1 34 3907028925 ffs
> dk1 created successfully.
> spectre# newfs -O2 dk1
> /dev/rdk1: 1907729.0MB (3907028920 sectors) block size 32768,
> fragment size 4096
>         using 2570 cylinder groups of 742.31MB, 23754 blks, 46848 inodes.
> super-block backups (for fsck_ffs -b #) at:
> 192, 1520448, 3040704, 4560960, 6081216, 7601472, 9121728, 10641984,
> 12162240,
> ...............................................................................
> spectre# raidctl -uv raid1
> spectre# gpt show wd3
>        start        size  index  contents
>            0           1         PMBR
>            1           1         Pri GPT header
>            2          32         Pri GPT table
>           34  3907029101      1  GPT part - NetBSD RAIDFrame component
>   3907029135          32         Sec GPT table
>   3907029167           1         Sec GPT header
> 
> The Problem is now, that there is already a gpt table on wd3.
> How could be create a second gpt partition with shift of 64 sectors?

I don't remmember but man gpt should tell you.
The offset of the new partition should be 34 (offset of raid partition on
wd3) + 64 (space used by raidframe metadata) + 34 (offset of ffs partition
in raid volume)

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--