Virtual disks for an i partition

[Pete Helgren <pete@xxxxxxxxxx>]

I have heard this a few times now so I want to make sure I understand 
this because I may reconfigure my JS12 blade in the near future.

Dr Franken, and I think Rob Berendt (many moons ago), both mentioned 
virtual arms being key.  I had originally configured the Blade and SAS 
modules incorrectly, operating on some limited knowledge of the whole 
environment by creating a physical mirrored pair for VIOS and a physical 
mirrored pair for IBM i.  I recently installed another Blade Center and 
had a few light bulbs come on about virtual disks vs the SAS Storage 
Module.  I think the general approach should be that you raid together 
the physical disks into a large array and then build a single large 
volume and create smaller virtual disks from the larger volume as needed.

So a few questions:

I seem to recall that the recommendation for VIOS installation use two 
mirrored physical disks but now I am not so sure that is necessary if 
the 6  320 GB drives in the SAS cage were one volume and then two 
smaller virtual disk were carved out for VIOS.  Is my assumption about 
physical disks for VIOS incorrect?

If I understand Rob and the good Doctor correctly, I should carve out at 
least 6 virtual disks for IBM i?  Then in IBM i I also create a RAID 
array from those 6 disks (or is that redundant?)

I guess I never fully virtualized my thinking:  The configuration of IBM 
i on VIOS should mimic a physical configuration. Yes?