RAID

[Anders Karlsson]

On 1/1/06, Phillip Susi <psusi at cfl.rr.com> wrote:
> 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.

Then the drivers are broken for the fakeraid controllers. If the ips
driver can properly present only logical drives through int 13h and
there is no trace of anything but the logical drives once the kernel
is up, the only conclusion is that the drivers for the fakeraid
controllers are broken.

I have played with netfinity boxes with ips raid cards, and I know
that whether you do raid 0, 1 or 5, you will see nothing but the
logical disks once the kernel is up and running.

--
Anders Karlsson <trudheim at gmail.com>