Linux Servers

Monitored Parameters

Applications Manager monitors the key performance indicators of Linux servers to detect any performance problems. These indicators include CPU, memory, disk, etc.

The Availability tab shows the availability history of the Linux server for the past 24 hours or 30 days. The Performance tab shows some key performance indicators of the Linux server such as physical memory utilization, CPU utilization, response time and swap memory utilization along with heat charts for these attributes. This tab also shows the health status and events for the past 24 hours or 30 days.

The List view lists all the Linux servers monitored by Applications Manager along with their overall availability and health status. It enables you to perform bulk admin configurations. Click on the individual monitors listed to view detailed performance metrics.

To view detailed performance metrics of a Linux server, click on the monitor name listed in the Availability or List View tabs. The performance metrics have been categorized into 4 different tabs:

• Overview

• CPU

• Disk

• Configuration

• Hardware

Overview

This tab provides a high-level overview of the health and performance of the Linux server along with information pertaining to the processes and services running on the system.

You can use the Custom Fields option in the 'Monitor Information' section to configure additional fields for the monitor.

The overview tab shows dials for CPU, memory and disk utilization. You can click on these dials to view detailed graphs and charts for these attributes. The graphs available are History report, hour of day report, day of week report and heat chart. These graphs can be generated for both real time and historical data.

The CPU and memory utilization - last six hours graph shows the memory usage and CPU usage values for the last six hours. The attributes shown here are swap memory utilization, physical memory utilization (in % and MB) and CPU utilization (%).

The Breakup of CPU Utilization graph provides a break up of performance metrics for the entire system processor with attributes such as run queue, blocked process, user time(%), system time(%), I/O wait(%), idle time(%) and interrupts/sec.

The System Load graph provides you an idea of the amount of work that the system performs. The system load during the last one-, five- and fifteen-minute periods are represented by parameters such as Jobs in Minute, Jobs in 5 minutes and Jobs in 15 minutes.

The Process Details section shows information about the processes running on the Linux server. You can add processes for monitoring using the Add New Process option. You can also delete unwanted processes and enable/disable reports for specific processes. Click on any of the attributes listed to view more details.

The Monitors in this System section shows the availability and health of the monitors configured in this server. To add new monitors for monitoring, use the Add Monitors option.

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CPU

This tab provides the CPU usage statistics of the Linux server. The tab includes two graphs - one that displays the CPU utilization by CPU Cores and another that shows the Breakup of CPU utilization - by CPU cores. You can view additional reports by clicking the graphs present in the Breakup of CPU Utilization - by CPU cores section. These reports include Break up of CPU Utilization (%) Vs Time, User Time (%) Vs Time, System Time (%) Vs Time, I/O Wait Time (%) Vs Time, Idle Time (%) Vs Time, CPU Utilization (%) Vs Time and Interrupts/sec Vs Time for all the CPU cores.

The CPU tab also shows the following performance metrics:

Parameter	Description	Monitoring Mode
		Telnet/SSH	SNMP
Core	The name of the CPU core
User Time(%)	The percentage of time that the processor spends on User mode operations. This generally means application code.
System Time(%)	The percentage of CPU kernel processes that are in use.
I/O Wait Time(%)	The time spent by the processor to waiting for I/O to complete.
Idle Time(%)	The time when the CPU is idle (not being used by any program)
CPU Utilization(%)	Specifies the total CPU used by the system
Interrupts/sec	The rate at which CPU handles interrupts from applications or hardware each second. If the value for Interrupts/sec is high over a sustained period of time, there could be hardware issues.

You can also view graphs for these attributes by selecting the necessary CPU core and then choosing the appropriate attribute.

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Disk

This tab displays disk usage and disk I/O statistics of the Linux server.

You can also delete disks that have been physically removed using the Delete Orphaned Disk option.

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Configuration

This tab contains information about system configuration attributes.

Hardware Metrics

The following are metrics pertaining to the hardware of Dell and HP servers:

Category	Attribute	Description	DELL		HP
			SNMP Mode	WMI Mode	SNMP Mode	WMI Mode
Temperature	Sensor	The name of the temperature sensor.
	Temperature Reading (deg C)	The current /present temperature reading.
	Status	The temperature status - Critical, Warning, Clear
Fan	Sensor	Name of the fan sensor.
	Fan Speed (RPM)	The fan speed values displayed in RPM.
	Status	The fan status - Critical, Warning, Clear
Power	Sensor	Name of the power supply.
	Reading (Watts)	The power supply reading values displayed in Watts.
	Status	The power status - Critical, Warning, Clear
Voltages	Sensor	Name of the voltage supply.
	Reading (Volts)	The voltage reading values displayed in Volts.
	Status	The voltage status - Critical, Warning, Clear
Battery	Sensor	Name of the Battery sensor..
	Status	The battery status - Critical, Warning, Clear
Memory	Sensor	Name of the Memory sensor.
	Memory Device Type	The type of memory device
	Size (MB)	The amount of memory currently installed in MB.
	Status	The memory status - Critical, Warning, Clear
Disk	Sensor	Identifies the disk's label
	Device Name	The device name configured for the disk
	Size (MB)	The allocated size in MB
	Status	The disk status - Critical, Warning, Clear.
Array	Sensor	The name of the array disk
	Bus protocol	The bus type of the array disk
	Size (MB)	The amount in MB of the used space on the array disk.
	Status	The array status - Critical, Warning, Clear
Chassis	Sensor	The user-assigned chassis name of the chassis.
	Model	The system model type for this chassis
	Status	The chassis status - Critical, Warning, Clear
Processor	Sensor	The location name of the processor device status probe
	Processor Brand	The brand of the processor device.
	Processor Current Speed	The current speed of the processor device in MHz
	Processor Core Count	The number of processor cores detected for the processor device.
	Status	The processor status - Critical, Warning, Clear

• If a component is functioning normally, the status indicator is green.

• The status indicator changes to orange or red if a system component violates a performance threshold or is not functioning properly. Generally, an orange indicator signifies degraded performance.

• A red indicator signifies that a component stopped operating or exceeded the highest threshold.

• If the status is blank, then the health monitoring service cannot determine the status of the component.

Hardware Device-Level Configuration

Hardware Configuration option available under Host Details in the right hand side of the details page, will allow you to opt for the various hardware components you want to monitor. This operation can also be done using the Performance Polling option under the Admin tab which will globally configure the hardware stats.

Advanced Settings

By clicking the Advanced Settings option available under Host Details in the right hand side of the details page, you can go to the Performance Data Collection page for Servers.

Here you can use the Hardware Health monitoring option to enable or disable hardware monitoring in servers. You can also opt the various hardware components (like power, fan, disk,etc.,) to be monitored by checking the options given. This will globally configure the hardware monitoring status. You can also configure the health status by defining values in the respective text boxes:

• Critical Severity: If the status matches with any of the values defined in the Critical Severity text box, then Applications Manager displays the status of the hardware device as Critical. The values defined by default are failed, error, failure, nonRecoverable, criticalUpper, criticalLower, nonRecoverableLower and critical.

• Warning Severity: If the status matches with any of the values defined in the Warning Severity text box, then Applications Manager displays the status of the hardware device as Warning. The values defined by default are degraded, warning, nonCritical, nonCriticalUpper, nonRecoverableUpper and nonCriticalLower.

• Clear Severity: If the status matches with any of the values defined in the Clear Severity text box, then Applications Manager displays the status of the hardware device as clear. The value defined by default is 'ok'.
  

  Note If the status of the device does not match with any of the values defined in the severity text box, the device status is displayed as unknown. Status values defined within the severity text boxes are comma-separated and case-insensitive.

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See Also

Creating New Linux Server Monitor