The last one I setup was in 2003, seemed like ten years ago. I actually 
had connected two 12h arrays to this particular box in 03, and I did put 
ldev 1 on one of the arrays. Never had a problem. I did replace a drive 
or two over the years but the machine always stayed up during the 
rebuild of the new drive. Thanks for the heads-up, it is something to 
consider. Maybe the problem you describe was due to the power fail and 
the boot process. Maybe I'll keep the system volume on the original 
internal drives. My plan was to (worked in the past) raid all critical 
volumes, including the SYSTEM volume. Then utilize the original internal 
(non-raid) drives for temporary/sort scratch area. This gives me another 
I/O channel for real time processing, and a little boost in performance.

I want to thank everyone for their input, and the PDF's sent off list 
;-) I think I got what I needed, very much appreciated!

Michael Anderson,
J3k Solutions




Brett Forsyth wrote:
> 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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>
>   

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