When Discovery runs, a classifier
called vCenter classifies the process running on a Windows or Linux machine.
Discovering vCenter CIs
After classifying vCenter, Discovery launches the VMware - vCenter
Datacenters probe, which in turn launches specific probes that return information about ESX
machines, virtual machines, and other vCenter objects. The vmapp port probe is also
configured to launch the VMware - vCenter Datacenters probe.
If you use a domain account to access vCenter, specify the
domain with the user name in the credential record in one of the supported formats such as
Updating the CMDB with vCenter event collectorThe vCenter event collector is a MID Server extension that listens
for vCenter-related events.
The event collector allows the CMDB to be updated with changes
to virtual machines (VMs), in addition to the updates detected by Discovery. A change to a
VM is sent as an event from the vCenter server to the vCenter event collector. When an event
is received, the CMDB is updated accordingly. Full vCenter Discovery does not need to rerun.
For some events, such as powered on and powered off events, Discovery does not need to run
again at all. For most events, Discovery runs only on the necessary vCenter resource.
a list of events handled by default in a instance, see vCenter event collector. For instructions on configuring vCenter events, see Configure and run the vCenter event collector extension.
CIs removed from vCenter
When a vCenter CI, such as a virtual machine, is removed, the ServiceNow
instance marks it
as "stale" in the CMDB, using either of these procedures:
- When Discovery runs, it creates
an audit record in the CMDB Health Result [cmdb_health_result] table for the missing CI and marks the
- If the instance is configured to collect vCenter
events, the system can also create a "stale" audit record for the CI in the
CMDB Health Result [cmdb_health_result] table from the VmRemovedEvent event, without
having to run Discovery.
Note: When the Staleness setting is configured, the dependency view (BSM map)
grays out stale CIs in its relationship diagram to indicate that they were removed from