--- title: ServiceNow Discovery Setup | Apex Configuration Group description: "ServiceNow Discovery setup done in phases: identification rules, credentials and schedules agreed first, so scans build the CMDB without duplicates or outages." --- [![APEX CONFIGURATION GROUP](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/ACG-logo.png?width=135&height=93&name=ACG-logo.png "APEX CONFIGURATION GROUP")](https://www.apexconfiguration.com/) [![APEX CONFIGURATION GROUP](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/ACG-logo.png?width=135&height=93&name=ACG-logo.png "APEX CONFIGURATION GROUP")](https://www.apexconfiguration.com/) - [Home](https://www.apexconfiguration.com) - ServiceNow - [ServiceNow CMDB](https://www.apexconfiguration.com/servicenow-cmdb) - [CMDB Health Check](https://www.apexconfiguration.com/cmdb-health-check) - [CMDB Design & Implementation](https://www.apexconfiguration.com/cmdb-design-implementation) - [Managed Service](https://www.apexconfiguration.com/managed-cmdb-services) - [Automation & Optimisation](https://www.apexconfiguration.com/cmdb-automation-tools) - Maximising ServiceNow - [CMDB Health Dashboard](https://www.apexconfiguration.com/cmdb-health-dashboard-servicenow) - [CMDB Dependency Mapping](https://www.apexconfiguration.com/cmdb-relationship-table) - [CMDB Configuration Items](https://www.apexconfiguration.com/cmdb-configuration-items) - [CMDB Workspace](https://www.apexconfiguration.com/cmdb-workspace-servicenow) - [CMDB Best Practice](https://www.apexconfiguration.com/cmdb-best-practices) - [ServiceNow Discovery](https://www.apexconfiguration.com/servicenow-discovery-setup) - [Service Mapping](https://www.apexconfiguration.com/servicenow-service-mapping) - About - [How We Help](https://www.apexconfiguration.com/about-apex) - [What is a CMDB?](https://www.apexconfiguration.com/what-is-cmdb) - [Benefits](https://www.apexconfiguration.com/benefits-of-cmdb) - Resources - [Blog](https://www.apexconfiguration.com/blog) - [Contact Us](https://www.apexconfiguration.com/contact-us) [Contact Us](https://www.apexconfiguration.com/contact-us) [Contact Us](https://www.apexconfiguration.com/contact-us) - [Home](https://www.apexconfiguration.com) - ServiceNow - [ServiceNow CMDB](https://www.apexconfiguration.com/servicenow-cmdb) - [CMDB Health Check](https://www.apexconfiguration.com/cmdb-health-check) - [CMDB Design & Implementation](https://www.apexconfiguration.com/cmdb-design-implementation) - [Managed Service](https://www.apexconfiguration.com/managed-cmdb-services) - [Automation & Optimisation](https://www.apexconfiguration.com/cmdb-automation-tools) - Maximising ServiceNow - [CMDB Health Dashboard](https://www.apexconfiguration.com/cmdb-health-dashboard-servicenow) - [CMDB Dependency Mapping](https://www.apexconfiguration.com/cmdb-relationship-table) - [CMDB Configuration Items](https://www.apexconfiguration.com/cmdb-configuration-items) - [CMDB Workspace](https://www.apexconfiguration.com/cmdb-workspace-servicenow) - [CMDB Best Practice](https://www.apexconfiguration.com/cmdb-best-practices) - [ServiceNow Discovery](https://www.apexconfiguration.com/servicenow-discovery-setup) - [Service Mapping](https://www.apexconfiguration.com/servicenow-service-mapping) - About - [How We Help](https://www.apexconfiguration.com/about-apex) - [What is a CMDB?](https://www.apexconfiguration.com/what-is-cmdb) - [Benefits](https://www.apexconfiguration.com/benefits-of-cmdb) - Resources - [Blog](https://www.apexconfiguration.com/blog) - [Contact Us](https://www.apexconfiguration.com/contact-us) [Contact Us](https://www.apexconfiguration.com/contact-us) [tel:+442080588135](tel:+442080588135)[mailto:contact@apexconfiguration.com](mailto:contact@apexconfiguration.com) # ServiceNow Discovery Setup Horizontal Discovery that finds what is actually on the estate, writes it to the CMDB once, and doesn't take fragile equipment down. [Book A Meeting](https://cta-eu1.hubspot.com/web-interactives/public/v1/track/click?encryptedPayload=AVxigLIuzpnrFoVNubzPnbN68LbMr217PduXcwzT3yYURg9jxT4KVBaAD0%2BQfgdjtScqT8l%2B3Xrv5jlyHQ1IMBOQgBzAX%2FJ9ZLgTWSGSr1wmqsIuMv0R8d9M8CrkkrQFGaz%2FVm3c2LwXa2rUNCA9fBMTEC6F5rSco%2F9Cj1nm%2B77FnrFJTMdiMHe6faMhQSI%2B7ojQIugSM7o%3D&portalId=147949153) [CMDB Diagnostic Call](https://cta-eu1.hubspot.com/web-interactives/public/v1/track/click?encryptedPayload=AVxigLJQMHTWIsSY3dVecreEi4sigj5TC14IQ5ZjyKttb7Uz4vQKiqQXMNRMWXtcU431oJ0w4UzDle4tKVweQWmQGzK6yeAzoNHC3p1BUjxtm01y4gSRTukdconxqk46Xjdx1inxqIwdukICQ780WhEeWBzBGPaDVc%2BHU5D%2Ftd%2B%2BHyQjSp4G6UM4R9bmlYOaai%2FdFZtc0EFI3UXKiFo%3D&portalId=147949153) ## What a Discovery rollout has to get right ServiceNow Discovery scans your network with probes and sensors, then writes what it finds to the configuration management database (CMDB) as configuration items (CIs). The scanning is the easy part. A rollout works when identification rules, credentials, schedules and reconciliation order are agreed before the first scan runs. When they aren't, Discovery does what it's told. It creates duplicates, overwrites good data, or hits equipment that was never meant to be scanned. ![Team of colleagues discussing project details together in an office](https://www.apexconfiguration.com/hs-fs/hubfs/Apex%20Configuration%20-%20Website%20Images%20(4).webp?width=1125&height=844&name=Apex%20Configuration%20-%20Website%20Images%20(4).webp) ## What Discovery finds Discovery reports what answered a probe. That is the raw material for the CMDB, not the finished record. Servers, virtual machines and containers Servers, virtual machines and containers Network devices, storage and end user devices Network devices, storage and end user devices Installed software and running processes Installed software and running processes The relationships between them The relationships between them Every record Discovery finds passes through the Identification and Reconciliation Engine (IRE) before it reaches the CMDB. If those rules are wrong, Discovery repeats the error on every scan. Our article on [how identification rules prevent duplicates](https://www.apexconfiguration.com/blog/servicenow-identification-rules-how-cmdb-duplicate-prevention-really-works) explains where that goes wrong. ![CMDB](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/6.webp?width=1200&height=900&name=6.webp) ## Keep the CMDB aligned with the estate Scheduled scans catch new systems, changed configurations and retired equipment, provided each range has a schedule and working credentials.  Discovery ensures:  New systems are captured on the next scheduled scan New systems are captured on the next scheduled scan Changes to existing CIs are detected and updated Changes to existing CIs are detected and updated Equipment that stops answering can be flagged for review Equipment that stops answering can be flagged for review Ranges with no schedule or failing credentials show up as gaps Ranges with no schedule or failing credentials show up as gaps This removes reliance on manual updates and exposes the gaps that manual records hide. For where Discovery ends and configuration management begins, see [why ServiceNow Discovery isn't a CMDB](https://www.apexconfiguration.com/blog/servicenow-discovery-isnt-a-cmdb). [![\CMDB Diagnostic Call\](https://hubspot-no-cache-eu1-prod.s3.amazonaws.com/cta/default/147949153/interactive-378363509978.png)](https://www.apexconfiguration.com/hs/cta/wi/redirect?encryptedPayload=AVxigLI%2B%2BFAEXSl6HrJQnj19em5v%2BUTkiXQ9reVZM11iLWEhczSP2%2Bo%2Bpk%2B8VCevF%2FWv2ClLbMUSVWKMD0DijzehPMaXJ8o%2FgPbcXfMW1rBkGRviHOdot5%2BQ%2Fj47gkNwOcQBaoyefFHvuGQ8p3lIdJ2CBB5RtqrN0VtTkuECogx6SHD%2BDol46KzjbfmcliZHq9gQSNa0d5Ibgw8mg7E%3D&webInteractiveContentId=378363509978&portalId=147949153) ## How we set Discovery up Most failed rollouts fail before the first scan. We work through these steps in order. 1. **Report on duplicates first.** Group the existing CIs by serial number and correlation ID before touching any rule, because rules written on top of duplicates encode them. 2. **Agree identification and reconciliation.** For each class we set which identifier entry matches a record, and which source may write which attribute. 3. **Give Discovery its own servers.** Discovery servers shouldn't double as utility servers, so scan load doesn't compete with other work. 4. **Test credentials range by range.** A range with failing credentials looks the same as an empty one from inside the CMDB, so each is tested before it is scheduled. 5. **Pilot one range.** We compare what the scan finds with what the owners expected before adding more. 6. **Schedule around the estate.** Scans run outside peak windows at a pace the equipment tolerates, and fragile devices are excluded or scanned lightly. ## What goes wrong when it is skipped On one broadcast estate, scans ran every probe against every address at once. Delicate broadcast equipment failed, and several service-impacting incidents followed. We replaced them with a light-touch horizontal scan using custom pattern extensions we wrote, once we knew what hardware was in each room. On another, a scan of a subnet believed to be offline took a production control room down during a live broadcast. The room looked offline because its equipment was recorded as in stock, so it had no dependency relationships. On a cloud estate, an integration with a security tool created a second copy of every virtual machine, and ServiceNow didn't recognise them as duplicates. The count was double what an administrator could see in the tool. We disabled that import and replaced it with the AWS Service Graph Connector. Our article on [why ServiceNow integrations fail without accurate data](https://www.apexconfiguration.com/blog/servicenow-integration-accurate-data-value) covers the wider pattern. ![Two colleagues reviewing data on multiple monitors in an office](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/5.webp?width=1200&height=900&name=5.webp) ## Discovery without taking anything down Scanning can affect production equipment, so we plan for that before anything runs. Three risks decide how a rollout is planned: #### Impact on critical production systems Scan windows, pacing and exclusions are agreed for each range. #### Credential and access control Accounts are scoped to each range and tested before anything is scheduled. #### Duplicate and overwritten data Identification and reconciliation rules are agreed before the first write. We implement Discovery in phases, range by range, and review each phase before the next begins. ## How Apex helps Our discovery and integration coverage review establishes what is missing from your estate view, where it is missing, and what that costs during an incident. It covers horizontal Discovery and third-party tool integration through Service Graph Connectors, and we scope it with you at an initial consultation. If duplicates are already the problem, our data quality assessment measures your CMDB against weighted critical success factors, key performance indicators and metrics. It shows where de-duplication, normalisation and reconciliation are failing and why. ## ServiceNow Discovery questions ### Why does Discovery create duplicates? Usually because the identification entries are too weak, or because a second source creates the same CI and nothing tells ServiceNow they match. Fix the rules and the source precedence before you widen the scan. ### Can Discovery take equipment down? Yes. Running every probe against every address at once has failed delicate equipment. Scan windows, pacing and exclusions are agreed for each range before anything is scheduled. ### Is Discovery the same as Service Mapping? No. Discovery finds CIs across a network range. [ServiceNow Service Mapping](https://www.apexconfiguration.com/servicenow-service-mapping) starts from a business application and works down to the infrastructure it uses. ### How long does a rollout take? It depends on the size of the estate and the number of credentials involved. We agree the phases before scanning starts, and review each one before the next begins. ## The outcome   An accurate, up-to-date CMDB   Coverage gaps you can see and close   Scans that don't disturb production Want to know what your Discovery is missing? [Book a meeting](https://www.apexconfiguration.com/book-a-meeting) with a consultant, or start with a [CMDB diagnostic call](https://www.apexconfiguration.com/cmdb-diagnostic-call). ![IT professional holding a tablet in a data centre with server racks](https://www.apexconfiguration.com/hs-fs/hubfs/Act3%20child/images/11.webp?width=1200&height=900&name=11.webp) ## Trusted by Organisations Worldwide ![Nova Action logo](https://www.apexconfiguration.com/hs-fs/hubfs/14%20(1).webp?width=144&height=90&name=14%20(1).webp) ![RTL Kockica logo](https://www.apexconfiguration.com/hs-fs/hubfs/26%20(1).webp?width=144&height=90&name=26%20(1).webp) ![RTL Living logo](https://www.apexconfiguration.com/hs-fs/hubfs/27%20(1).webp?width=144&height=90&name=27%20(1).webp) ![RTL Croatia World logo](https://www.apexconfiguration.com/hs-fs/hubfs/25%20(1).webp?width=144&height=90&name=25%20(1).webp) ![Markíza Krimi logo](https://www.apexconfiguration.com/hs-fs/hubfs/12%20(1).webp?width=144&height=90&name=12%20(1).webp) ![Nova Fun logo](https://www.apexconfiguration.com/hs-fs/hubfs/16%20(1).webp?width=144&height=90&name=16%20(1).webp) ![TV Markíza logo](https://www.apexconfiguration.com/hs-fs/hubfs/13%20(1).webp?width=144&height=90&name=13%20(1).webp) ![Nova Cinema logo](https://www.apexconfiguration.com/hs-fs/hubfs/15%20(1).webp?width=144&height=90&name=15%20(1).webp) ![TV Nova logo](https://www.apexconfiguration.com/hs-fs/hubfs/17%20(1).webp?width=144&height=90&name=17%20(1).webp) ![Nova Krimi logo](https://www.apexconfiguration.com/hs-fs/hubfs/18%20(1).webp?width=144&height=90&name=18%20(1).webp) ![Pro Cinema logo](https://www.apexconfiguration.com/hs-fs/hubfs/20%20(1).webp?width=144&height=90&name=20%20(1).webp) ![Nova Lady logo](https://www.apexconfiguration.com/hs-fs/hubfs/19%20(1).webp?width=144&height=90&name=19%20(1).webp) ![Pro TV International logo](https://www.apexconfiguration.com/hs-fs/hubfs/21%20(1).webp?width=144&height=90&name=21%20(1).webp) ![RTL Adria logo](https://www.apexconfiguration.com/hs-fs/hubfs/23%20(1).webp?width=144&height=90&name=23%20(1).webp) ![Ring logo](https://www.apexconfiguration.com/hs-fs/hubfs/22%20(1).webp?width=144&height=90&name=22%20(1).webp) ![Multiskill logo](https://www.apexconfiguration.com/hs-fs/hubfs/1%20(1).webp?width=144&height=90&name=1%20(1).webp) ![Acasă Gold logo](https://www.apexconfiguration.com/hs-fs/hubfs/2%20(1).webp?width=144&height=90&name=2%20(1).webp) ![bTV Action logo](https://www.apexconfiguration.com/hs-fs/hubfs/4%20(1).webp?width=144&height=90&name=4%20(1).webp) ![RTL Crime logo](https://www.apexconfiguration.com/hs-fs/hubfs/24%20(1).webp?width=144&height=90&name=24%20(1).webp) ![Acasă logo](https://www.apexconfiguration.com/hs-fs/hubfs/3%20(1).webp?width=144&height=90&name=3%20(1).webp) ![bTV Comedy logo](https://www.apexconfiguration.com/hs-fs/hubfs/7%20(2).webp?width=144&height=90&name=7%20(2).webp) ![Dajto logo](https://www.apexconfiguration.com/hs-fs/hubfs/9%20(2).webp?width=144&height=90&name=9%20(2).webp) ![bTV Cinema logo](https://www.apexconfiguration.com/hs-fs/hubfs/6%20(2).webp?width=144&height=90&name=6%20(2).webp) ![Doma logo](https://www.apexconfiguration.com/hs-fs/hubfs/10%20(3).webp?width=144&height=90&name=10%20(3).webp) ![bTV Story logo](https://www.apexconfiguration.com/hs-fs/hubfs/8%20(3).webp?width=144&height=90&name=8%20(3).webp) ![RTL Passion logo](https://www.apexconfiguration.com/hs-fs/hubfs/28%20(1).webp?width=144&height=90&name=28%20(1).webp) ![bTV logo](https://www.apexconfiguration.com/hs-fs/hubfs/5%20(2).webp?width=144&height=90&name=5%20(2).webp) ![RTL 2 logo](https://www.apexconfiguration.com/hs-fs/hubfs/29%20(1).webp?width=144&height=90&name=29%20(1).webp) ![TN CZ logo](https://www.apexconfiguration.com/hs-fs/hubfs/30%20(1).webp?width=144&height=90&name=30%20(1).webp) ## Structured Delivery Process Structured approach. Clear outcomes. No overengineering Step 1 Step 2 Step 3 Step 4 ### 1. Assess & Diagnose Comprehensive assessment of your current CMDB state, data quality, and automation maturity.  ### 2. Design for Clarity Architect a CSDM-aligned data model and automation framework tailored to your environment.  ### 3. Implement & Automate Build automated discovery, data validation, and self-healing processes for sustained accuracy.  ### 4. Govern & Optimise Establish governance frameworks, KPIs, and continuous monitoring to maintain CMDB health.  Trusted By Fortune 500 Enterprises | ServiceNow Certified Experts ## Ready To Gain Control & Clarity? Partner with specialists who deliver accurate, automated, and resilient CMDBs for enterprise organisations. 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