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What is the Intersite Replication Latency Threshold?

“The Intersite replication latency threshold is the maximum amount of time that can be required for a change to replicate across the entire forest. This value is typically monitored to ensure that basic help desk procedures, such as resetting passwords or performing replication from corporate headquarters to a branch office, are completed within a reasonable amount of time.”

Consult the ADMP Guide for more details…

Issue:

You’ve installed System Center Operations Manager 2007 and successfully deployed the Active Directory Management Pack to all Domain Controllers in your organization.  Now you are getting a ton of alerts stating that AD replication is occurring slowly.  The default threshold value for this monitor is set to 15 minutes.  Your alerts are stating that your DC’s are updating their objects at 30 minute intervals, which is twice the defined default threshold value.  Microsoft recommends setting this value to one-third the number of minutes defined by your SLA.  The ADMP Guide explains how to modify this monitor on page 13.  You execute the steps to adjust the Intersite Expected Max Latency (min) property to 1/3 your defined SLA value.   However, you still have alerts coming in stating that the DCs are replicating above the default 15 minute defined threshold.

Problem:

The guide tells you to adjust the Intersite Expected Max Latency (min) property in the AD Replication Monitor.  The monitor works by executing a script (Ad_replication_monitoring_helper1.vbs) at timed intervals to check replication.  What is not explained is that four other rules also use this exact same script to collect performance information and are inadvertently kicking off the alerts. They can be found under the Authoring/Rules section.

• AD Replication Performance Collection - Metric Replication Latency (ALL)

Resolution:

Follow the same steps as outlined on page 13 of the ADMP Guide to set overrides for the four performance collection rules.

Applies to:

System Center Operations Manager 2007 RTM, SP1 RC

Active Directory Management Pack 6.0.5000.0