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The takeaway

To have a healthy infrastructure, you need reliable configuration data in the CMDB. You can maintain reliability of data by managing duplicate CIs and through accurate infrastructure mapping.

Identify duplicate CI records and resolve them with your CMDB

When you run ServiceNow Discovery, you might find duplicate CIs. Discovery finds these CIs and adds them as a deduplication task for you via the identification and reconciliation engine. You should work with CI owners to resolve them. For example, one Discovery customer runs a background script that automatically identifies the duplicate CIs and escalates them to the CMDB owner. Since they have automated the escalation process, they don’t have to go through each CI manually. All this data is tracked via the CMDB dashboard.

Figure 6: The CMDB dashboard makes it easy to track duplicate CIs and share status with stakeholders

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Heads up!

Watch the number of duplicate records showing up in the CMDB.

When the CMD is manually seeded and the infrastructure targets aren’t managed by Discovery, then the CMDB identification and reconciliation process will be unable to reconcile the data from different sources. We recommend that you match all the CI classes being imported with those found with Discovery when you reconcile them. Be sure to review the Discovery identifiers to ensure a match between discovered and imported CI records. That way, Discovery won’t return duplicate CIs.

When the Now Platform CMDB is replacing an incumbent CMDB, then the best approach is to upload your legacy CMDB into a user‑defined table, and create on‑demand scheduled jobs to reconcile what Discovery finds against the legacy CMDB data. This establishes the new CMDB as the source of truth.

Use the Discovery CI schedule manager to access all discovered devices, errors that might occur during discovery, and unidentified IP addresses. The CI schedule manager provides a summary of discoveries triggered from configuration item schedules.

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Figure 7: CI schedule manager lets you manage your schedules seamlessly

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Reliable dependency mapping gives a complete picture of your infrastructure

Discovery is horizontal data mapping, which means that you find details of each device along with applications and software running on them. We recommend that you enable enhanced application dependency mapping (ADM) to get regular samples of the network traffic to identify applications running on devices. This will let you find newly added applications on servers.

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Figure 8: Discovery is a horizontal process that finds all the infrastructure dependencies OOTB

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Beyond horizontal discovery, service mapping gives you an additional layer of insights via a top‑down discovery approach that also uses ADM. Discovery customers use this approach to find all the relationships and dependencies of applications tied to critical business services. We’ve found that customers have even better visibility of their infrastructure and a much healthier CMDB with service mapping.

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Figure 9: Service mapping gives you infrastructure and service dependencies

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

A service map builds relationships among infrastructure components, tying critical services to devices and applications.

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

“Before, if we needed ad hoc enterprise configuration information, it would take more than a day to get reliable information. Now, that same type of query takes minutes.”  – Oak Ridge National Laboratories

MID Server

Each MID Server is a lightweight Java process that can run on a Linux, Unix, or Windows server. During discovery, the MID Server executes probes and patterns and returns the results back to the instance for processing. It doesn’t retain any information.

 

Expert Tip

EXPERT TIP

Complete horizontal discovery of your network before top‑down relationship mapping. When you complete the horizontal discovery of your network first, it will give you confidence that you have complete visibility into devices, systems, and applications before you map services.

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