5 Working With OSWatcher Black Box
Oracle OSWatcher Black Box (OSWbb) collects and archives OS and network metrics that you can use to diagnose performance issues. OSWbb operates as a set of background processes on the server and gathers data often, invoking such UNIX utilities as vmstat, mpstat, netstat, iostat, and top.
OSWbb is useful for Oracle RAC (Real Application Clusters) and Oracle Grid Infrastructure configurations. The RAC-DDT (Diagnostic Data Tool) script file includes OSWbb, but doesn't install it by default.