On Thu, Mar 26, 2015 at 12:36:53PM -0500, Mark Nelson wrote: > Having said that, small nodes are > absolutely more expensive per OSD as far as raw hardware and > power/cooling goes. The smaller volume manufacturers have on the units, the worse the margin typically (from buyers side). Also, CPUs typically run up a premium the higher you go. I've found a lot of local maximas, optimization-wise, over the past years both in 12 OSD/U vs 18 OSD/U dedicated storage node setups, for instance. There may be local maximas along colocated low-scale storage/compute nodes, but the one major problem with colocating storage with compute is that you can't scale compute independently from storage efficiently, on using that building block alone. There may be temporal optimizations in doing so however (e.g. before you have reached sufficient scale). There's no single optimal answer when you're dealing with 20+ variables to consider... :) BR, Martin
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