Soft-Raid Testing and other stuff...

[Ed Wilts]

On Thu, Jan 20, 2005 at 11:17:01AM -0000, Richard Hobbs wrote:
> > > I didn't duplicate the MBR as far as I know... I assumed that RAID 1
> > > (mirroring) mirrored the entire disk, sector for sector...

Nope - it's partition by partition.  That's why you did the raidhotadd
*per partition*.

There are pros and cons to this approach - the biggest pro is that you
don't have to mirror the entire disk.  The biggest con is that only data
partitions are mirrored.

For details on mirror the mbr, see:
http://www.dur.ac.uk/a.d.stribblehill/mirrored_grub.html

I haven't tried this but it's referenced by the online Red Hat
documentation.

> > > Also, if I then insert a blank disk, will it automatically 
> > > re-generate the
> > > data onto it? Will I have to duplicate the MBR manually again?
> > > 

You will always have to do this manually.  Software RAID knows nothing
about the MBR - only partitions.

-- 
Ed Wilts, RHCE
Mounds View, MN, USA
mailto:ewilts at ewilts.org
Member #1, Red Hat Community Ambassador Program