> Once a Linux image is built, if additional space is needed we're
hoping
> we can simply add the larger SCSI disk to the volume group.  

First comment is that Mother's Rule #1 (mix not data and system code
lest peril ensue) applies here. It is a much better idea IMHO to have
separate LVM spaces for data and system code. 

> I am
> having a hard time finding information on mixing disk architecture in
> an LVM.  Since the CKD is emulating FBA, does LVM even care that it is
> CKD as opposed to FBA?

If you are truly running the box as FCP SCSI, then there is no CKD at
all. VM emulates 9336 FBA devices on pure SCSI setups if you use
emulation at all. FCP SCSI LUNs do not necessarily have emulation
enabled -- you can choose to not use mainframe device emulation entirely
if you have FCP storage, but you cannot manage that space with DIRMAINT
or similar tools.  

> Is anyone out there doing this?

It's probably wiser not to mix emulated FBA and true FCP SCSI partitions
in the same LVM. 

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