Hello, With 3.7 we added a couple of things to smooth collection issue : 1. To bubble up values from a node to an upper node we use MakeRange formula rather than Nop (in case of a collector stops for a long period of time we will use the latest known value) 2. We don't use the raw data but aggregates (it allows to align time-series data point and avoid not having a blank value in case we miss a polling cycle)  The discrepancies you noticed are probably caused by raw data not being aligned.  In attachment you will find a report which should suits your needs. It is a simple report which you can improve. You will noticed that when you click on an array you will see a chart. This is a tip we commonly use when I don't understand why the results are odd. Instead of a table we use a chart so we can see when it goes wrong.  Let me know if it works.
 Greetings,  I am working on creating a custom report in Vipr SRM 3.7 that SUMs themetric "name==Capacity" for each Mapped and Masked LUN on a VNX arrayand shows that summed value along with the LUN Count in the Parent report. I amusing this formula to Sum the LUN Capacity metrics, "math.spatial.Sum" on the child node and using that value in my Parent Table.   It seems the formula is not always consistent in its sumation. Sometimes I see the correct value in the report and other times not, (i am checking it manual against an export of all Masked and Mapped LUN capacities).    Does anyone know why the formula values appear to be inconsistent?    I can provide the report definition if that would help.     Thanks.
Formula Results Inconsistent using math.spatial.Sum