Data Collection and Thresholds 1

8/8/2019 Data Collection and Thresholds 1

1/14

29 July 2010Copyright 2006

Service Ambition Motivation Accuracy Reliable TeamworkHonest Accountable

Data collection and Thresholds


2/14



Data Collection

is

obtaining useful information.

The issue is not: How do we collect data?

It is: How do we obtain useful data?

What Is Data Collection?


3/14



Data Collection Overview

NNM provides the ability to monitor MIB object valueson any managed node (with SNMP).

Why? Monitor what is critical to your business.

You customize the polling interval at which values aremonitored.

Polled values can be stored on the management

station.

Polled values can trigger events at thresholds youspecify.


4/14



Examining Data Collection

Configurations

Top PaneOrigin: indicates whether the MIB entry is part of an externally definedcollection or was defined through the ovw Data Collector user interface.Status: collecting if Data Collector is enabled, suspended if the Data Collector

collecting is disabledLabel: the name of the MIB object or expression that is being collectedMIB object id: the full numeric MIB name or the MIB expression name of theobject

Top PaneOrigin: indicates whether the MIB entry is part of an externally definedcollection or was defined through the ovw Data Collector user interface.Status: collecting if Data Collector is enabled, suspended if the Data Collector

collecting is disabledLabel: the name of the MIB object or expression that is being collectedMIB object id: the full numeric MIB name or the MIB expression name of theobject

Bottom Paneinterval: Polling interval of MIB object/expression on configured Source.Store: yes If collected data is to be stored or noThreshold: yes or noInstances: MIB instances which are collectedSource :The name(s) or address ranges of the nodes from which the data iscollected.

Bottom Paneinterval: Polling interval of MIB object/expression on configured Source.Store: yes If collected data is to be stored or noThreshold: yes or noInstances: MIB instances which are collectedSource :The name(s) or address ranges of the nodes from which the data iscollected.


5/14



Data Collection Configuration


6/14



Creating a MIB Expression

The first item is the MIB expression name. The second item is a description of the expression, enclosed in quotes. The third item is the MIB expression

dotted notation for the MIB object postfix notation

You add an expression to the mibExpr.conf file. You must then stop and restart the data collector configuration GUI, Options:Data Collection & Thresholds:SNMP.

The first item is the MIB expression name. The second item is a description of the expression, enclosed in quotes. The third item is the MIB expression

dotted notation for the MIB object postfix notation

You add an expression to the mibExpr.conf file. You must then stop and restart the data collector configuration GUI, Options:Data Collection & Thresholds:SNMP.

An expression created from MIB objects allows you to look at

relationships between object or interpret values.MIB Expressions are defined in:%OV_CONF%\mibExpr.conf (Windows)$OV_CONF/mibExpr.conf (UNIX)To have new expressions available, stop and restart the data

collector configuration GUI.

example of a MIB expression

.If%deferred \Percent of packets on an interface which were deferred\n\Computed by:\n\(packets deferred rate/packets transmitted rate)\n\then converted to a percentage. \.1.3.6.1.4.1.11.2.4.1.1.1.4. \.1.3.6.1.4.1.11.2.4.1.1.1.2. \/ 100 *

example of a MIB expression

.If%deferred \Percent of packets on an interface which were deferred\n\Computed by:\n\(packets deferred rate/packets transmitted rate)\n\then converted to a percentage. \.1.3.6.1.4.1.11.2.4.1.1.1.4. \.1.3.6.1.4.1.11.2.4.1.1.1.2. \

/ 100 *


7/14



Setting Collection Options

Collection ModeThe Set Collection Mode pop-uplist allows you to do one of thefollowing things with thiscollection:

Exclude Collection Store, Check Thresholds Store, No Thresholds. Poll Dont Store, Check Thresholds

Collection ModeThe Set Collection Mode pop-uplist allows you to do one of thefollowing things with thiscollection:

Exclude Collection Store, Check Thresholds Store, No Thresholds. Poll Dont Store, Check Thresholds

Source and Collection Options

The source can be a list of nodes

or a wildcarded IP address range.

The Instances selector determineswhich interfaces snmpCollect gathersinformation about.

Source and Collection Options

The source can be a list of nodes

or a wildcarded IP address range.

The Instances selector determineswhich interfaces snmpCollect gathersinformation about.

Multiple Node and Instances per

MIB Object

You can set multiple collectiondefinitions on a single MIB objectnode. When data collection isdone on a node that has numerousinstances, you can set up

collections on any number of theinstances.

Multiple Node and Instances per

MIB Object

You can set multiple collectiondefinitions on a single MIB objectnode. When data collection isdone on a node that has numerousinstances, you can set up

collections on any number of theinstances.

Filtering Data Collection

You can filter the objects on whichsnmpCollect gathers data by enteringa filter name in theCollection Node Filter box inOptions:Data Collection and Thresholds.

Filtering Data Collection

You can filter the objects on whichsnmpCollect gathers data by enteringa filter name in theCollection Node Filter box inOptions:Data Collection and Thresholds.

Multiple sysObjectID

When collecting from a wildcardedList of Collection Sources, OnlyCollect on Nodes With

SysObjectID can be used to furtherrestrict from which nodes data iscollected.

Multiple sysObjectID

When collecting from a wildcardedList of Collection Sources, OnlyCollect on Nodes With

SysObjectID can be used to furtherrestrict from which nodes data iscollected.


8/14



Time

MIB

Ob

je

ctV

alue


9/14



Threshold and Rearm Events

Why? Configure special instructions for when yourthreshold/rearm events are received.

Default threshold/rearm event configurations only logevents in the threshold events category.

Default threshold event configuration isOV_DataCollectThresh (58720263).

Default rearm event configuration isOV_DataCollect_Rearm (58720264).

By default, when a data collection threshold is exceeded, an OpenView enterprise-specificevent with Specific Event ID (SID) 58720263 is generated. Similarly, rearm events aregenerated with an SID of 58720264. Matching event configurations for these two SIDsare defined in the Event Configurator.

By default, when a data collection threshold is exceeded, an OpenView enterprise-specificevent with Specific Event ID (SID) 58720263 is generated. Similarly, rearm events aregenerated with an SID of 58720264. Matching event configurations for these two SIDsare defined in the Event Configurator.

You can configure these events to cause pop-up notifications or be forwarded, just as youwould configure any event.You can configure these events to cause pop-up notifications or be forwarded, just as youwould configure any event.


10/14



Customizing the Threshold Event


11/14



Turning Data Collections On and Off

Enable/disable collecting MIB object/expression dataon all sources via the Actions:Suspend (Resume)Collections menu item.

Enable/disable collection on individual sources bychoosing the Exclude Collection pop-up list item.

Suspend and ResumeTo disable the data collection for all sources, the easiest thing to do is to suspend the

collection. From the Options menu, select Data Collections and Thresholds toopen the list of data collections. Select the collection that you want to suspend, andselect Actions:Suspend. Remember to do a File:Save for this action to take effect.

If you later decide to begin collecting the data again, use the Actions:Resume function.

Suspend and ResumeTo disable the data collection for all sources, the easiest thing to do is to suspend the

collection. From the Options menu, select Data Collections and Thresholds toopen the list of data collections. Select the collection that you want to suspend, andselect Actions:Suspend. Remember to do a File:Save for this action to take effect.

If you later decide to begin collecting the data again, use the Actions:Resume function.

Exclude from CollectionIn some cases you may need to disable data collection only one or two systems. To do this

you need to tell the collection that it should not collect on a particular system. Again, openthe list of collections, select the collection you wish to change and select Edit:AddCollection. This allows you to define the specific systems on which data collection shouldbe excluded.

Exclude from CollectionIn some cases you may need to disable data collection only one or two systems. To do this

you need to tell the collection that it should not collect on a particular system. Again, openthe list of collections, select the collection you wish to change and select Edit:AddCollection. This allows you to define the specific systems on which data collection shouldbe excluded.


12/14



Monitoring Data Collection

Current Data

1. Display the Data Collection & Thresholds: SNMP dialog box by selecting theOptions:Data Collection & Thresholds: SNMP menu item.

2. From the top pane, select a MIB object/expression with a status of Collecting.

3. Select the Actions:Show Data menu item.

Current Data

1. Display the Data Collection & Thresholds: SNMP dialog box by selecting theOptions:Data Collection & Thresholds: SNMP menu item.

2. From the top pane, select a MIB object/expression with a status of Collecting.

3. Select the Actions:Show Data menu item.

Historical Data

1. Graphically. Click [Graph] from the Data Collection & Thresholds / Show Data window.

2.ASCII file. From the command prompt, carry out the snmpColDump command against the file

containing the collected data. The collected data is in a file named MIBlabel.instance. There is

also an associated control file named MIBlabel.instance!. You can view the control file with

any editor. For viewing the collected data:

$OV_BIN/snmpColDump $OV_DB/snmpCollect/ifInOctets.1(on UNIX system)

or

%OV_BIN%\snmpColDump "%OV_DB%\snmpCollect\ifInOctets.1"

(on Windows operating systems)

Historical Data

1. Graphically. Click [Graph] from the Data Collection & Thresholds / Show Data window.

2.ASCII file. From the command prompt, carry out the snmpColDump command against the file

containing the collected data. The collected data is in a file named MIBlabel.instance. There is

also an associated control file named MIBlabel.instance!. You can view the control file with

any editor. For viewing the collected data:

$OV_BIN/snmpColDump $OV_DB/snmpCollect/ifInOctets.1(on UNIX system)

or

%OV_BIN%\snmpColDump "%OV_DB%\snmpCollect\ifInOctets.1"

(on Windows operating systems)


13/14



Interface Utilization:You can use the Interface Utilization graph tocompare the percentage of traffic flowing on the selected interfaces as compared tothe overall capacity of the interface.

Packet Rate:You can use the Interface Traffic Packet Rate graph todetermine the average number of packets sent or received on the node orinterface(s) over a period of time.

Throughput:You can use the Interface Traffic Packet Throughput graph todetermine the number of successful packets sent and received over the node orinterface(s) over a period of time.

Byte Rate:You can use the Interface Traffic Data Rate graph to determinethe average number of bytes that are received or transmitted over the selectednode or interfaces over some period of time.

S i bi i i i li bl k


14/14



Thank You

Documents

Data Collection and Thresholds 1