Dynamically building on spare device / boot device.

[AndrewJohnson at HBOSplc.com]

Hi, 
 
I'm trying to identify the best approach to dynamically identify whether
a client has a spare disk to build Logical Volumes against or whether I
need to deploy them onto the rootdisk. At present i've built the post
script that deliveries  the following:
 
Validate Volume Groups,
If no additional Volume Groups available Built on RootVG
Validate Available Space and Add LV's
 
However I'm wondering on how to accuratly identify which disk is free
and what approach should be taken to build a VG on it with removing  the
wrong disk, i'm new to this so any help would be greatly appreciated,
i've tried a couple of %pre scripts but assuming rootvg is always going
to be on sda isn't always true.
 
Kind Regards
 
Andy

 
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