Performance graphs

Server and Cluster Administration Guide for Hitachi NAS Platform

Part Number

Data about system performance, load, and capacity is gathered at short intervals (typically every 10 seconds) and these data points are kept for the previous 24 hours. Data older than 24 hours is periodically aggregated; the raw data is averaged and only a single hourly average value is kept. Aggregating the data in this fashion minimizes the overhead of millions of data points and allows data to be retained longer. If all the data points were retained, the data set would quickly grow, and would become unmanageable. The system stores the performance data for one year in order to provide a long-term, historical view of system performance.