Re: GPT and raid seems ok, missing disks awkward

[Petar Bogdanovic <petar%smokva.net@localhost>]

On Wed, May 23, 2012 at 10:01:12AM -0400, Greg Troxel wrote:
> 
>   If you intend to boot from this (ffs @ gpt @ raidframe @ gpt @ disk),
>   you'll probably need this ugly duckling:
> 
>      -       bios_sector += RF_PROTECTED_SECTORS;
>      +       bios_sector += RF_PROTECTED_SECTORS+34;
> 
> Interesting point.  What I have done is
> 
>   gpt on disk, with raidframe partition at 64
>   in raid, regular disklabel
>     raid0a starting at 0
> 
> I think for 2T (vs 2.5T or bigger) I don't really need gpt, but I like
> having a clear label on the disk show up in dmesg when it attaches.
> 
> So I think boot will only need to skip the 64 RF sectors after first
> finding the raid partition from parsing the gpt label.  Does that sound
> right?

Yes, boot knows how to deal with disklabel @ raidframe so as long as you
stick with it you won't need that hack even if your raidframe is @ gpt @
disk.

(sorry for the silly @-notation)