It's a very light Redhat Linux and Oracle OVM System Performance Monitoring tool written in Perl using rrdtool for Database and Graphing. Allows you to query the RRD database given a set of dates and generates a web based graphs. Easy to install. Uses less disk space than most performance monitoring tool. Data of each host monitored is kept for 2 years and occupy less that 25 MB of disk space.
JRobin is a 100% pure Java alternative to RRDTool, with about exactly the same specifications. If you provide the same data to RRDTool and JRobin, you will get exactly the same results and graphs. All standard RRDTool operations are supported.