I'll search through my records, for I have done this before and there is a 
factory formula, but I just wanted to point one thing out first:

No 12Hs as Ldev 1

If the 12H ever goes into a rebuild, such as in a powerfailure, or a disc failure 
ISL will not let you boot successfully until the rebuild has been finished.  

I sat waiting upon one of these with a client, getting multiply disc i/o errors 
while trying to boot, fearing that the system - not currently backed up - was 
totally wiped out.

After the rebuild has finished, about 8 hours later, all worked fine and booted 
as normal.

...and this is why HP does not support 12Hs as LDEV 1 on 3000s

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