R: [dm-devel] - info about dm

[Phillip Susi]

Vega Forneris wrote:
> 1) I need to change an HD which has problems...here the steps I guess
> from what I read in these days:
> - halt the machine (ok, ok it's obvious ;-P )
> - change the faulty HD
> - boot
> - when BIOS starts the RAID manager, enter and rebuild the RAID (1:
> mirror)
> - after the rebuilding, everything should be ok.
> 
> ...is it correct?

Yes... at least if your bios actually starts the rebuild process instead 
of just marking the array as needing rebuilt and relying on the OS to do 
it.

> 2) I have a machine with 2 HD SATA, on the first we have the OS
> installed (and working!), the second is blank (just added), I want to
> create a RAID 1 (mirror) of the whole disk:
> - ...
> I don't want to guess ;-P

The same way you did it the first time: in the bios.  Doing so will 
destroy the existing data on the drive though, so you will want to 
backup first.