Can you talk a little bit about how many nodes it takes to maintain that write rate?  We have our own system that&#x27;s currently handling around 1% of that on a single node, with decent headroom but I&#x27;ve been looking for ways to distribute it.  Certainly word on the street is that OpenTSDB performance is not good, at least relative to the resources you throw at it; however since it&#x27;s  based on HBase you can keep scaling even if it&#x27;s expensive.