RAID

[Phillip Susi]

Again, they DO see a single disk through int 13h which is why you can 
boot from the array.  When you set up the array using the bios utility 
it writes some data to the end of the disks to describe the array just 
like a real hardware raid does.  When you boot up, the bios int 13h uses 
that information to present a single disk to grub/lilo, allowing it to 
load the kernel from a /boot filesystem that is inside the array ( 
striped across both disks in my case ).

Of course, the kernel does not use int 13h, hence the need for the 
device mapper and the dmraid utility to configure it based on the bios 
parameter block at the end of the disks.

Anders Karlsson wrote:
> 
> If they have that capability, they certainly don't use it. grub and
> linux should not see the disks that make up the array, only the array
> itself, if int 13h was used properly.
> 
> --
> Anders Karlsson <trudheim at gmail.com>
>