C.4.6. General::uptime (Snmp); C.5. Linux; C.5.1. Linux::cpu Usage; C.5.2. Linux::disk Io Throughput - Red Hat NETWORK SATELLITE 5.1.1 Reference Manual

Appendix C. Probes

C.4.6. General::Uptime (SNMP)

The General::Uptime (SNMP) probe records the time since the device was last started. It uses the
SNMP object identifier (OID) to obtain this value. The only error status it will return is UNKNOWN.
Requirements — SNMP must be running on the monitored system and access to the OID must be
enabled to perform this probe.
This probe's transport protocol is User Datagram Protocol (UDP).
Field
SNMP Community String*
SNMP Port*
SNMP Version*
Timeout*
Table C.14. General::Uptime (SNMP) settings

C.5. Linux

The probes in this section monitor essential aspects of your Linux systems, from CPU usage to virtual
memory. Apply them to mission-critical systems to obtain warnings prior to failure.
Unlike other probe groups, which may or may not require the Red Hat Network Monitoring Daemon,
every Linux probe requires that the rhnmd daemon be running on the monitored system.

C.5.1. Linux::CPU Usage

The Linux::CPU Usage probe monitors the CPU utilization on a system and collects the following
metric:
• CPU Percent Used — The five-second average of the percent of CPU usage at probe execution.
Requirements — The Red Hat Network Monitoring Daemon (rhnmd) must be running on the
monitored system to run this probe.
Field
Timeout*
Critical Maximum CPU Percent Used
Warning Maximum CPU Percent Used
Table C.15. Linux::CPU Usage settings

C.5.2. Linux::Disk IO Throughput

The Linux::Disk IO Throughput probe monitors a given disk and collects the following metric:
• Read Rate — The amount of data that is read in kilobytes per second.
• Write Rate — The amount of data that is written in kilobytes per second.
To obtain the value for the required Disk number or disk name field, run iostat on the system to
be monitored and see what name has been assigned to the disk you desire. The default value of 0
usually provides statistics from the first hard drive connected directly to the system.
212
Value
public
161
2
15
Value
15