The Operating System Layer
Like the Linux model, the Operating System layer of the HPUX model too is mapped to a SystemDetails test that tracks the CPU and memory utilization, and a DiskSpace test that monitors the disk utilization. Also, similar to the Linux model, the Operating System layer of the HPUX model too measures memory usage, IO waits, swap usage, and uptime of the host. All these tests have been discussed elaborately in The Operating System Layer
Figure 1 : Tests that map to the Operating System layer of an HPUX server
The difference however lies in the DiskActivity test of the HPUX model. The metrics reported by this test are slightly different for the Linux and HPUX models. The sub-section that follows will discuss this test alone.