Hi,

I am afraid you only can get 
the generic IT answer: "it depends".

E.g., for me a large raid 1 set build up from 10 disks
with multiple db /log / stgpool volumes on it, 
single PCI bus in the host and single scsi controller
proved to work very well, much better
then *sm mirroring on single disks.
But the speciality is raid controller with its own
disk access multithreaded optimizer with Intel 
I960RP/66MHz and 128MB 50ns cache RAM, 
disks are Seagate´s 80MB/s Cheetahs
with low latency and short access times.

During migrations etc. there are 
usually 2 to 25 IO´s in the controller queue,
so the optimizer does have enough stuff to optimze.

When using different disk subsystem,
multiple scsi controllers,
another bus architectures , 
slower hosts cpu,
or even when saving another kind 
of data like databases
then would my configuration be disadvantegous,
I am quite sure.

For me, I will try raid (raid 1 plus stripping)
for stg pool volumens next time.

You already now much about how *sm 
uses the disk volumes, 
check it against your environment,
create a setup you believe in 
and let us later now how good you succeeded!

Have a good try!
Juraj Salak