Jon, I don't doubt your experience, but it's not quite fair or even sensible to make a decision today based on what was available in the GPFS 2.3 era.
We are now at GPFS 4.2 with support for 3 way replication and FPO. Also we have Raid controllers, IB, and "Native Raid" and ESS, GSS solutions and more. So more choices, more options, making finding an "optimal" solution more difficult. To begin with, as with any provisioning problem, one should try to state: requirements, goals, budgets, constraints, failure/tolerance models/assumptions, expected workloads, desired performance, etc, etc.
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