nmon (short for Nigel's Monitor) is a free system monitor tool for the AIX and Linux operating systems, like Oracle VM. nmon concentrates on performance information for the performance tuner and in a concise layout to aim understanding. This includes: CPU, memory, disks, adapters, networks, NFS, Kernel statistics, File-systems, Workload Manger (AIX), Workload Partitions (AIX) and Top Processes.
Even if your using the Infrastructure Cloud, and OS Watcher for your Oracle VM environments, nmon is still very complimentary, and provides detailed performance information for Oracle VM servers.
- On screen via an ssh session to an Oracle VM server. Using single characters on the keyboard enable/disable various sorts of data. nmon displays the CPU, memory, network, disks, file systems, NFS, top processes, and system resources.
- nmon can be setup to save the data to a comma separated file for analysis and longer term data capture.
Download and nmon usages:
- Download nmon for Oracle VM.
- Copy nmon onto each Oracle VM Server in the /usr/local/sbin directory.
- Make the nmon scipt executable by typing: chmod 755 nmon
- As root, type nmon to run the application
nmon keyboard shortcuts:
q - To stop and exit nmon.
h - To see quick help (hint) screen and press h again to remove the hints.
Use the following command to turn on or off stats:
c - See cpu stats.
m - See memory stats.
d - See disk stats.
k - See kernel stats.
n - See network stats.
N - See NFS stats.
j - See file system stats.
t - See top process.
V - See virtual memory stats.
. - See only busy disks/procs.
v - Verbose mode (display as Ok/warning/danger on screen).