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What Are The Basic Difference Among Discovery, Service Watch & Event Management?

In ServiceNow ITOM, there are various processes that keep on engaging and updating. In the same way, we have discovery, Service watch, Service mapping, and Event Management. In this article, i am quoting the basic difference between these three terms.

DiscoveryService MappingEvent Management
Discovery performs what we refer to as “horizontal” discovery of IT infrastructure and applications connected to TCP/IP networks.Service Mapping performs a top-down, “vertical” discovery and mapping of a business service using one or more entry points.The event management application consolidates events integrated from different monitoring tools (e.g., SCOM, Nagios, SolarWinds, etc.) and performs processing of the events to produce actionable alerts.
Discovery discovers all the infrastructure and applications it can find but establishes no relationship with business servicesService Mapping only discovers the infrastructure and applications that are directly supporting a business service and maps their relationships.Alerts can be [automatically] related to CIs, and if the CIs are related to business services, then the severity of the alerts can be used to detect the impact on the business services.
Discovery’s approach is like broad coverage, such as a shotgunService Mapping is pin-point and precise, like a sniper’s rifleEvent Management is a consumer of service maps created and updated by Service Mapping.
For each discovered device/host, Discovery adds a CI to the ServiceNow CMDB, or updates existing CIs with new information.Once a business service has been mapped , Service Mapping performs routine re-discoveries to detect changes, such as the addition of removal of servers in clusters, updated software, changed configuration files, etc.Since you know how the CIs are related to the business service, it’s possible to perform root cause analysis to identify which CI is the probable cause of a service outage or disruption.

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