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ESX server discovery

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ESX server discovery

Discovery identifies and classifies information about ESX servers and ESX resource pools through the discovery of vCenter and not from the direct discovery of any ESX servers.

Important: ESX server discovery is done through vCenter. Do not specify the IP address of the ESX server in a Discovery Schedule. Instead, discover the vCenter through the Discovery Schedule.

For a description of the VMware architecture and component relationships, see Data collected for VMware vCenter Server.

For a discussion of how Discovery collects information on datastores and establishes the relationships between the ESX hosts and the storage disks attached to the datastores, see Datastore Discovery

Required Roles

Users with the itil and asset roles can access ESXii and ESXi configuration item (CI) records. To run discovery on vCenter servers, users must have the discovery_admin role.


To run a complete Discovery of vCenter/ESX servers, you need vCenter credentials. If the vmapp port probe is disabled, you must use Windows credentials to access the Windows host on which the vCenter server runs.
Note: Make sure to select a credential Type of VMware.

ESX server Discovery components

Discovery identifies ESX servers based on the combination of correlation ID (BIOS UUID) and Managed Object Reference ID, when the hardware manufacturer is on a certified white list. Manufacturers not on this list are identified by serial number. After running the vCenter classifier, Discovery launches the VMware - vCenter Datacenters probe, which launches the probes that explore the ESX server. For the complete list of vCenter probes, see List of Discovery probes.

Component Name Description
Classifier vCenter Classifies stand-alone vCenter servers.
Probe VMWare - vCenter ESX Hosts Creates records for ESX servers and hostmounts. Creates relationships between ESX servers and vCenter components. Triggers probes for storage Discovery.
Probe VMWare - vCenter ESX Hosts Storage Creates records for ESX host hardware: network adapters, disks, HBAs, FC ports, iSCSI and FC disks. Creates relationships between DAS/iSCSI/FC disks and datastore disks.

Data collected

Basic server data from ESX hosts is collected by the VMware - vCenter ESX Hosts probe.
Table 1. Data collected by Discovery on ESX hosts
Label Table Name Field Name
Operating System cmdb_ci_esx_server os
OS Version cmdb_ci_computer os_version
Short description cmdb_ci_esx_server short_description
Name cmdb_ci_esx_server name
DNS domain cmdb_ci_esx_server dns_domain
Start date cmdb_ci_esx_server start_date
Manufacturer cmdb_ci_computer manufacturer
Serial number cmdb_ci_computer serial_number
CPU type cmdb_ci_esx_server cpu_type
CPU speed (MHz) cmdb_ci_esx_server cpu_speed
CPU count cmdb_ci_esx_server cpu_count
CPU core count cmdb_ci_computer cpu_core_count
CPU core thread cmdb_ci_computer cpu_core_thread
CPU manufacturer cmdb_ci_esx_server cpu_manufacturer
Model number cmdb_ci_computer model_number
Model ID cmdb_ci_computer model_id
RAM (MB) cmdb_ci_esx_server ram
Disk space (GB) cmdb_ci_esx_server disk_space
Type cmdb_ci_disk type
Model ID cmdb_ci_disk model_id
Disk space (GB) cmdb_ci_disk disk_space
Name cmdb_ci_disk name
Name cmdb_ci_network_adapter name
IP address cmdb_ci_network_adapter ip_address
MAC address cmdb_ci_network_adapter mac_address
Netmask cmdb_ci_network_adapter netmask
Default gateway cmdb_ci_hardware default_gateway
Managed object reference ID Visualization Server [cmdb_ci_virtualization_server] morid
Serial Number Serial Number [cmdb_serial_number] serial_number


Discovery collects the following relationship data for ESX servers.
Base Class Relationship Dependent Class
ESX Resource Pool [cmdb_ci_esx_resource_pool] Defines resources for:Gets resources from ESX Server [cmdb_ci_esx_server]
VM Instance [cmdb_ci_vmware_instance] Registered on:Has registered ESX Server [cmdb_ci_esx_server]
ESX Server [cmdb_ci_esx_server] Provides storage for:Stored on VM Template [cmdb_ci_vmware_template]
ESX Server [cmdb_ci_esx_server] Provided by:Provides Networks [cmdb_ci_vcenter_network]
ESX Server [cmdb_ci_esx_server] Members of:Members Cluster [cmdb_ci_vcenter_cluster
ESX Server [cmdb_ci_esx_server] Contains:Contained by Datacenter [cmdb_ci_vcenter_datacenter]

ESX resource pools

Resource pools are configured in vCenter and define the maximum amount of resources that virtual machines using that pool can consume. An ESX server property enables resource pools to expand when necessary if the ESX server has additional resources to spare. The Name and Owner fields of each resource pool on the ESX server must be configured within the Now Platform

in the ESX Resource Pool [cmdb_ci_esx_resource_pool] table. When Orchestration for VMware executes its manual provisioning tasks, the provisioner must select the proper resource pool for the virtual server requested. Discovery finds resource pools on ESX machines and populates the fields on the ESX Resource Pool form automatically. For more information, see Configure ESX resource pools.

ESX resource pools requires the Orchestration - VMware Support plugin.

Note: Ensure that vCenter and the ESX server have been fully configured, including the creation of the templates and resource pools.
Table 2. Data collected
Label Table Field Name Source
CPU expandable ESX Resource Pool [cmdb_ci_esx_resource_pool] cpu_expendable VMWare - vCenter Clusters probe
CPU limit (MHz) ESX Resource Pool [cmdb_ci_esx_resource_pool] cpu_limit_mhz VMWare - vCenter Clusters probe
CPU reserved (MHz) ESX Resource Pool [cmdb_ci_esx_resource_pool] cpu_reserved_mhz VMWare - vCenter Clusters probe
CPU shares ESX Resource Pool [cmdb_ci_esx_resource_pool] cpu_shares VMWare - vCenter Clusters probe
Full path ESX Resource Pool [cmdb_ci_esx_resource_pool] fullpath VMWare - vCenter Clusters probe
Memory expandable ESX Resource Pool [cmdb_ci_esx_resource_pool] mem_expandable VMWare - vCenter Clusters probe
Memory limit (MB) ESX Resource Pool [cmdb_ci_esx_resource_pool] mem_limit_mb VMWare - vCenter Clusters probe
Memory reserved (MB) ESX Resource Pool [cmdb_ci_esx_resource_pool] mem_reserved_mb VMWare - vCenter Clusters probe
Memory shares ESX Resource Pool [cmdb_ci_esx_resource_pool] mem_shares VMWare - vCenter Clusters probe
Owner ESX Resource Pool [cmdb_ci_esx_resource_pool] owner VMWare - vCenter Clusters probe
Owner Managed Object Reference ID ESX Resource Pool [cmdb_ci_esx_resource_pool] owner_morid VMWare - vCenter Clusters probe