System Monitor Reference

Number of Users

The number of users tells you how many users are logged in to a given system.

The MIB variables computerSystem, fileSystemBavail, and fileSystemBsize from the hp-unix MIB provides the resource value to the monitor.

To verify the number of users on the system, use the uptime (1) command.

Alerts for number of users can be used to determine the best time to run backups or other maintenance, or for load-balancing, to disallow more than a certain number of users on a given system.

The minimum polling interval is 30 seconds. We recommend a longer interval. Short polling intervals may adversely affect system performance.

Job Queues

The job queue monitor checks the average number of processes that have been waiting for CPU and performing disk I/O over the last 1, 5, or 15 minutes. A value of 4 in /system/jobQueue5Min means that at the time of polling there was an average of 4 jobs in the queue over the last 5 minutes.

The MIB variables computerSystemAvgJobs1, computerSystemAvgJobs5, and computerSystemAvgJobs15 from the hp-unix MIB provides the resource value to the monitor.

To verify the load averages on the system, use the uptime (1) command.

The minimum polling interval is 30 seconds. Unless your system load tends to fluctuate wildly and need load-balancing attention frequently, set a polling interval greater than or equal to the job queue interval: 1, 5, and 15 minutes, respectively.

Filesystem Available Space

The filesystem monitor checks the number of megabytes available for use in each file system on the node. File systems must be mounted and active to be monitored. File systems mounted over the network, such as NFS file systems, are not monitored.

The MIB variables fileSystemBavail, and fileSystemBsize from the hp-unix MIB are used to calculate the number of available Kb in the file systems. The number is then divided by 1024 to get the number of available Mb.

You may have more file systems, or different names, depending on how you configured file systems on your system. You see that when a file system starts filling up, you can clean up old files or add disk space and reconfigure your file systems.

	NOTE: Because the “/” character is not valid in a resource name, it is replaced by the “_” character. So the file system /tmp/users would appear as the resource name /system/filesystem/availMb/tmp_users. For the same reason the root file system (/) is replaced by the name "root".

The minimum polling interval is 30 seconds. We recommend a longer interval; short polling intervals may adversely affect system performance. When configuring requests through EMS, a wildcard (*) is available to monitor all file systems on a system.