LDAP Search Time - sustained for 5 minutes - Yellow(>50msec)

 

Topic Last Modified: 2007-11-16

The Microsoft Exchange Server 2007 Management Pack for Operations Manager includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange Server 2007. For this Operations Manager rule, data is collected using the performance counter specified in the Details table.

To review the value of the performance counter that generated this alert, in the Operator Console, select this alert, and then click the Properties tab.

Details

Product Name

Exchange

Product Version

8.0 (Exchange Server 2007)

Event Source

MSExchange ADAccess Domain Controllers

Counter Name

LDAP Search Time

Instance Name

<All>

Sample Interval (in seconds)

60

Server Role

Ex. Common

Warning Threshold

>50

Critical Error Threshold

>100

MOM Rule Path

Microsoft Exchange Server/Exchange 2007/Common Components/Active Directory Access

MOM Rule Name

LDAP Search Time - sustained for 5 minutes - Yellow(>50msec).

Explanation

The LDAP Search Time performance counter shows the time in milliseconds (ms) that a Lightweight Directory Access Protocol (LDAP) search request takes to be fulfilled. The average value should be under 50 ms. Maximum values should not exceed 100 ms. This alert indicates that responses to LDAP search requests have been exceeding 50 ms for five minutes.

High LDAP search latencies can be caused by high remote procedure call (RPC) latencies and by increasing queues. High LDAP search latencies generally indicate one of the following problems:

  • Performance problem with the network connection to the domain controller.

  • Performance problems with the domain controller itself.

User Action

To reduce the time it takes for LDAP searches, do one or more of the following:

  • Ensure that the network performance between the Microsoft Exchange Server computer and the domain controllers it uses is not the bottleneck.

  • Monitor the Searches/sec performance counter to see if there is an unexpected surge in the number of searches Exchange is requesting from the Active Directory directory service.

  • Ensure that the domain controllers Exchange is using are not experiencing performance problems. You can investigate CPU usage, as well as disk and memory bottlenecks, on your Active Directory servers.

If you are having difficulty resolving the issue, contact Microsoft Product Support. For information about contacting support, visit the Contact Us page of the Microsoft Help and Support Web site.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

For More Information

To search the Microsoft Knowledge Base articles based on criteria that generated this alert, visit the Microsoft Help and Support Web site.